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

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

Zaqar 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: I0fde9d2f16f3cc77be3d4cab482fa0fb7ab9e7fc

.zuul.yaml

@@ -111,8 +111,7 @@
     templates:
       - check-requirements
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
-      - openstack-python3-train-jobs
+      - openstack-python3-ussuri-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

doc/requirements.txt

@@ -2,7 +2,6 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 openstackdocstheme>=1.18.1 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.3,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.3;python_version>='3.4'  # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD
 reno>=2.5.0 # Apache-2.0

playbooks/legacy/grenade-devstack-zaqar-base/run.yaml

@@ -32,6 +32,7 @@
           enable_plugin zaqar https://opendev.org/openstack/zaqar
           # Enable Zaqar Tempest plugin
           TEMPEST_PLUGINS='/opt/stack/new/zaqar-tempest-plugin'
+          USE_PYTHON3="True"
 
           EOF
         executable: /bin/bash

playbooks/legacy/rally-dsvm-zaqar-zaqar/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-zaqar
 

playbooks/legacy/tempest-devstack-zaqar-base/run.yaml

@@ -32,6 +32,7 @@
           enable_plugin zaqar https://opendev.org/openstack/zaqar
            # Enable Zaqar Tempest plugin
           TEMPEST_PLUGINS='/opt/stack/new/zaqar-tempest-plugin'
+          USE_PYTHON3="True"
 
           EOF
         executable: /bin/bash

releasenotes/notes/drop-py-2-7-09cf95d7d843d8f6.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of Zaqar
+    to support py2.7 is OpenStack Train. The minimum version of Python now
+    supported by Zaqar is Python 3.6.

requirements.txt

@@ -28,8 +28,6 @@ oslo.utils>=3.33.0 # Apache-2.0
 oslo.policy>=1.30.0 # Apache-2.0
 osprofiler>=1.4.0 # Apache-2.0
 SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
-enum34>=1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
-trollius>=2.1;python_version=='2.7' # Apache-2.0
 autobahn>=0.17.1 # MIT License
 requests>=2.14.2 # Apache-2.0
 futurist>=1.2.0 # Apache-2.0

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

@@ -1,9 +1,10 @@
 [tox]
 minversion = 2.0
-envlist = py27,py37,pep8
+envlist = py37,pep8
 skipsdist = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
@@ -22,30 +23,25 @@ commands =
 whitelist_externals = find
 
 [testenv:integration]
-basepython = python3
 setenv = {[testenv]setenv}
          ZAQAR_TEST_INTEGRATION=1
          OS_TEST_PATH=./zaqar/tests/functional
 commands = stestr run --serial --slowest {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands =
   doc8 doc/source
   flake8
 
 [testenv:genconfig]
-basepython = python3
 commands =
   oslo-config-generator --config-file etc/oslo-config-generator/zaqar.conf
 
 [testenv:genpolicy]
-basepython = python3
 commands =
   oslopolicy-sample-generator --config-file etc/zaqar-policy-generator.conf
 
 [testenv:cover]
-basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source zaqar --parallel-mode
@@ -56,11 +52,9 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:docs]
-basepython = python3
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
     -r{toxinidir}/doc/requirements.txt
@@ -68,7 +62,6 @@ commands =
     sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:api-ref]
-basepython = python3
 # This environment is called from CI scripts to test and publish
 # the API Ref to docs.openstack.org.
 #
@@ -82,11 +75,9 @@ commands =
     sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [testenv:releasenotes]
-basepython = python3
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
     -r{toxinidir}/doc/requirements.txt
@@ -113,7 +104,6 @@ max-line-length = 80
 local-check-factory = zaqar.hacking.checks.factory
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt