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

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

Senlin is ready with python 3 and ok to drop the
python 2.7 support.

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

Depends-On: https://review.opendev.org/#/c/693631/
Change-Id: I0377788d0db0e60d44c35f1d26eefd58502a452a

.zuul.yaml

@@ -2,19 +2,14 @@
     templates:
       - check-requirements
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
-        - senlin-dsvm-tempest-py27-api
         - senlin-dsvm-tempest-py3-api
         - senlin-tempest-api-ipv6-only
-        - senlin-dsvm-tempest-py27-functional
         - senlin-dsvm-tempest-py3-functional
-        - senlin-dsvm-tempest-py27-integration:
-            voting: false
         - senlin-dsvm-tempest-py3-integration:
             voting: false
         - openstack-tox-cover:
@@ -22,10 +17,8 @@
     gate:
       queue: senlin
       jobs:
-        - senlin-dsvm-tempest-py27-api
         - senlin-dsvm-tempest-py35-api
         - senlin-tempest-api-ipv6-only
-        - senlin-dsvm-tempest-py27-functional
         - senlin-dsvm-tempest-py35-functional
     experimental:
       jobs:
@@ -52,6 +45,7 @@
         senlin: https://opendev.org/openstack/senlin
       devstack_localrc:
         TEMPEST_PLUGINS: '/opt/stack/senlin-tempest-plugin'
+        USE_PYTHON3: true
       devstack_local_conf:
         test-config:
           $TEMPEST_CONFIG:
@@ -61,54 +55,6 @@
               delete_with_dependency: True
               health_policy_version: '1.1'
 
-- job:
-    name: senlin-dsvm-tempest-py27-api
-    parent: senlin-tempest-base
-    vars:
-      tempest_test_regex: senlin_tempest_plugin.tests.api
-      devstack_local_conf:
-        post-config:
-          $SENLIN_CONF:
-             DEFAULT:
-               cloud_backend: openstack_test
-
-- job:
-    name: senlin-dsvm-tempest-py27-functional
-    parent: senlin-tempest-base
-    vars:
-      tempest_test_regex: senlin_tempest_plugin.tests.functional
-      devstack_local_conf:
-        post-config:
-          $SENLIN_CONF:
-            DEFAULT:
-              cloud_backend: openstack_test
-              health_check_interval_min: 10
-
-- job:
-    name: senlin-dsvm-tempest-py27-integration
-    parent: senlin-tempest-base
-    vars:
-      tempest_test_regex: senlin_tempest_plugin.tests.integration
-      devstack_plugins:
-        zaqar: https://opendev.org/openstack/zaqar
-        heat: https://opendev.org/openstack/heat
-      devstack_localrc:
-        TEMPEST_PLUGINS: '"/opt/stack/senlin-tempest-plugin /opt/stack/zaqar-tempest-plugin"'
-      devstack_local_conf:
-        post-config:
-          $SENLIN_CONF:
-             DEFAULT:
-               health_check_interval_min: 10
-    required-projects:
-      - openstack/heat
-      - openstack/octavia
-      - openstack/python-zaqarclient
-      - openstack/senlin
-      - openstack/senlin-tempest-plugin
-      - openstack/zaqar
-      - openstack/zaqar-ui
-      - openstack/zaqar-tempest-plugin
-
 - job:
     name: senlin-dsvm-tempest-py3-api
     parent: senlin-tempest-base

doc/requirements.txt

@@ -4,6 +4,5 @@
 # this is required for the docs build jobs
 openstackdocstheme>=1.20.0 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.5,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.5;python_version>='3.4'  # BSD
 reno>=2.5.0 # Apache-2.0

playbooks/legacy/rally-dsvm-senlin-senlin/run.yaml

@@ -48,7 +48,7 @@
           export DEVSTACK_GATE_EXERCISES=0
           export DEVSTACK_GATE_PREPOPULATE_USERS=0
 
-          export DEVSTACK_GATE_USE_PYTHON3=False
+          export DEVSTACK_GATE_USE_PYTHON3=True
           export USE_KEYSTONE_V2API=0
           export RALLY_SCENARIO=$ZUUL_SHORT_PROJECT_NAME-senlin
 

releasenotes/notes/drop-py-2-7-154eeefdc9886091.yaml

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

setup.cfg

@@ -13,8 +13,6 @@ 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

tox.ini

@@ -1,10 +1,10 @@
 [tox]
 minversion = 2.0
-envlist = py27,py37,pep8,functional
+envlist = py37,pep8,functional
 skipsdist = True
 
 [testenv]
-
+basepython = python3
 # Note the hash seed is set to 0 until senlin can be tested with a
 # random hash seed successfully.
 setenv = VIRTUAL_ENV={envdir}
@@ -27,44 +27,34 @@ whitelist_externals = bash
 basepython = python3
 commands = oslo_debug_helper -t senlin/tests/unit {posargs}
 
-[testenv:debug-py27]
-basepython = python2.7
-commands = oslo_debug_helper -t senlin/tests/unit {posargs}
-
 [testenv:debug-py36]
 basepython = python3.6
 commands = oslo_debug_helper -t senlin/tests/unit {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands =
     flake8 senlin doc/source/ext
 
 [testenv:genconfig]
-basepython = python3
 envdir = {toxworkdir}/venv
 commands =
   {toxinidir}/tools/gen-config
 
 [testenv:genpolicy]
-basepython = python3
 envdir = {toxworkdir}/venv
 commands =
   {toxinidir}/tools/gen-policy
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source senlin --parallel-mode
 commands = {toxinidir}/tools/cover.sh {posargs}
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -W -b html doc/source doc/build/html
@@ -72,12 +62,10 @@ commands =
 whitelist_externals = rm
 
 [testenv:releasenotes]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:api-ref]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
@@ -97,12 +85,10 @@ local-check-factory = senlin.hacking.checks.factory
 import_exceptions = senlin.common.i18n
 
 [testenv:bandit]
-basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = bandit -r senlin -x tests -s B101,B104,B110,B310,B311,B506
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt