[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

Tempest is ready with python 3 and ok to drop the
python 2.7 support. Last Tempest version officially supported
for py2.7 is 23.0.0.

Now onwards, Tempest will test all stable branch with py3 jobs.
tempest-full and other py2 version of jobs definition are kept
for stable branch gate.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Change-Id: I75868d5c9b6630fe78958ff89e58a0aced09a6b3

.zuul.yaml

@@ -100,6 +100,7 @@
       devstack_localrc:
         ENABLE_FILE_INJECTION: true
         ENABLE_VOLUME_MULTIATTACH: true
+        USE_PYTHON3: False
       devstack_services:
         # NOTE(mriedem): Disable the cinder-backup service from tempest-full
         # since tempest-full is in the integrated-gate project template but
@@ -138,6 +139,9 @@
       - opendev.org/openstack/oslo.utils
       - opendev.org/openstack/oslo.versionedobjects
       - opendev.org/openstack/oslo.vmware
+    vars:
+      devstack_localrc:
+        USE_PYTHON3: True
 
 - job:
     name: tempest-full-parallel
@@ -146,11 +150,13 @@
     branches:
       - master
     description: |
-      Base integration test with Neutron networking and py27.
+      Base integration test with Neutron networking.
       It includes all scenarios as it was in the past.
       This job runs all scenario tests in parallel!
     vars:
       tox_envlist: full-parallel
+      devstack_localrc:
+        USE_PYTHON3: True
 
 - job:
     name: tempest-full-py3
@@ -345,6 +351,13 @@
       - stable/pike
       - stable/queens
       - stable/rocky
+    vars:
+      devstack_localrc:
+        USE_PYTHON3: False
+    group-vars:
+      subnode:
+        devstack_localrc:
+          USE_PYTHON3: False
 
 - job:
     name: tempest-multinode-full-py3
@@ -425,32 +438,16 @@
         devstack_localrc:
           USE_PYTHON3: true
 
-- job:
-    name: tempest-full-train
-    parent: tempest-full
-    override-checkout: stable/train
-
 - job:
     name: tempest-full-train-py3
     parent: tempest-full-py3
     override-checkout: stable/train
 
-- job:
-    name: tempest-full-stein
-    parent: tempest-full
-    override-checkout: stable/stein
-
 - job:
     name: tempest-full-stein-py3
     parent: tempest-full-py3
     override-checkout: stable/stein
 
-- job:
-    name: tempest-full-rocky
-    parent: tempest-full
-    nodeset: openstack-single-node-xenial
-    override-checkout: stable/rocky
-
 - job:
     name: tempest-full-rocky-py3
     parent: tempest-full-py3
@@ -511,12 +508,13 @@
     name: tempest-pg-full
     parent: tempest-full
     description: |
-      Base integration test with Neutron networking and py27 and PostgreSQL.
+      Base integration test with Neutron networking and PostgreSQL.
       Former name for this job was legacy-tempest-dsvm-neutron-pg-full.
     vars:
       devstack_localrc:
         ENABLE_FILE_INJECTION: true
         DATABASE_TYPE: postgresql
+        USE_PYTHON3: True
 
 - project-template:
     name: integrated-gate-networking
@@ -600,10 +598,9 @@
 - project:
     templates:
       - check-requirements
-      - integrated-gate
       - integrated-gate-py3
       - openstack-cover-jobs
-      - openstack-python3-train-jobs
+      - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
@@ -639,22 +636,13 @@
         - tempest-full-py3-ipv6:
             voting: false
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full-train:
-            irrelevant-files: *tempest-irrelevant-files
         - tempest-full-train-py3:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full-stein:
-            irrelevant-files: *tempest-irrelevant-files
         - tempest-full-stein-py3:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full-rocky:
-            irrelevant-files: *tempest-irrelevant-files
-            voting: false
         - tempest-full-rocky-py3:
             irrelevant-files: *tempest-irrelevant-files
             voting: false
-        - tempest-multinode-full:
-            irrelevant-files: *tempest-irrelevant-files
         - tempest-multinode-full-py3:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-tox-plugin-sanity-check:
@@ -673,8 +661,6 @@
               # tools/ is not here since this relies on a script in tools/.
         - tempest-ipv6-only:
             irrelevant-files: *tempest-irrelevant-files-2
-        - tempest-slow:
-            irrelevant-files: *tempest-irrelevant-files
         - tempest-slow-py3:
             irrelevant-files: *tempest-irrelevant-files
         - nova-live-migration:
@@ -701,8 +687,6 @@
             irrelevant-files: *tempest-irrelevant-files
         - neutron-tempest-dvr:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full:
-            irrelevant-files: *tempest-irrelevant-files
         - interop-tempest-consistency:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-test-account-py3:
@@ -719,7 +703,7 @@
             irrelevant-files: *tempest-irrelevant-files
         - neutron-grenade-multinode:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full:
+        - tempest-full-py3:
             irrelevant-files: *tempest-irrelevant-files
         - grenade-py3:
             irrelevant-files: *tempest-irrelevant-files
@@ -747,11 +731,8 @@
             irrelevant-files: *tempest-irrelevant-files
     periodic-stable:
       jobs:
-        - tempest-full-train
         - tempest-full-train-py3
-        - tempest-full-stein
         - tempest-full-stein-py3
-        - tempest-full-rocky
         - tempest-full-rocky-py3
     periodic:
       jobs:

doc/requirements.txt

@@ -3,6 +3,5 @@
 # process, which may cause wedges in the gate later.
 openstackdocstheme>=1.20.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD

doc/source/supported_version.rst

@@ -1,7 +1,7 @@
 Supported OpenStack Releases and Python Versions
 ================================================
 
-This Document list the officially supported OpenStack releases
+This document lists the officially supported OpenStack releases
 and python versions by Tempest.
 
 Compatible OpenStack Releases
@@ -24,13 +24,13 @@ For example: OpenStack Stein: Tempest 20.0.0
 * https://releases.openstack.org/stein/index.html#stein-tempest
 
 How to use Tempest tag on Extended Maintenance stable branch:
-* https://review.opendev.org/#/c/681950/
+
+* https://review.opendev.org/#/c/705098/
 
 Supported Python Versions
 -------------------------
 
 Tempest master supports the below python versions:
 
-* Python 2.7
 * Python 3.6
 * Python 3.7

releasenotes/notes/drop-py-2-7-730baf411876d5d8.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of Tempest
+    to support python 2.7 is Temepst 23.0.0. The minimum version of Python now
+    supported by Tempest is Python 3.6.

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/tempest/latest/
+requires-python = >=3.6
 classifier =
     Intended Audience :: Information Technology
     Intended Audience :: System Administrators
@@ -13,11 +14,11 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: Implementation :: CPython
 
 [files]
 packages =

setup.py

@@ -16,14 +16,6 @@
 # THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
     setup_requires=['pbr>=2.0.0'],
     pbr=True)

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = pep8,py36,py37,py27,bashate,pip-check-reqs
+envlist = pep8,py36,py37,bashate,pip-check-reqs
 minversion = 3.1.1
 skipsdist = True
 ignore_basepython_conflict = True