Drop python 2.7 support and testing

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

zun-tempest-plugin 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://review.opendev.org/#/c/691178/

Change-Id: If4cec36beab64c83a59ebc7cf5c98f3d15ba328b

.zuul.yaml

@@ -27,7 +27,6 @@
       - tempest-plugin-jobs
     check:
       jobs:
-        - zun-tempest-docker-sql
         - zun-tempest-py3-docker-sql
         - zun-tempest-py35-docker-sql-queens
         - zun-tempest-py35-docker-sql-rocky
@@ -36,7 +35,6 @@
     gate:
       queue: zun
       jobs:
-        - zun-tempest-docker-sql
         - zun-tempest-py3-docker-sql
         - zun-tempest-py35-docker-sql-queens
         - zun-tempest-py35-docker-sql-rocky

releasenotes/notes/drop-py-2-7-45bf75864e345d16.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of zun-tempest-plugin
+    to support py2.7 is OpenStack Train. The minimum version of Python now
+    supported by zun-tempest-plugin is Python 3.5.

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 :: 3.5
 

test-requirements.txt

@@ -4,8 +4,7 @@
 
 hacking<0.13,>=0.12.0 # 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
 openstackdocstheme>=1.20.0 # Apache-2.0
 # releasenotes
 reno>=2.5.0 # Apache-2.0

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.0
-envlist = py35,py27,pep8
+minversion = 3.1.1
+envlist = py35,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install {opts} {packages}
 setenv =
@@ -15,30 +17,24 @@ deps =
 commands = python setup.py test --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
-basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:docs]
-basepython = python3
 commands =
     doc8 --ignore D000 -e .rst doc/source/ CONTRIBUTING.rst HACKING.rst README.rst
     python setup.py build_sphinx
 
 [testenv:releasenotes]
-basepython = python3
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]