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

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

monasca-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://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Change-Id: I27c82c48541291553141c197cb9c227720cc6dbb

.zuul.yaml

@@ -6,18 +6,15 @@
       - publish-openstack-docs-pti
     check:
       jobs:
-        - monasca-tempest-python2-influxdb
         - monasca-tempest-python3-influxdb
-        - monasca-tempest-python2-cassandra
+        - monasca-tempest-python3-cassandra
         - monasca-tempest-log-python3-influxdb:
             voting: false
         - build-monasca-docker-image
     gate:
       queue: monasca
       jobs:
-        - monasca-tempest-python2-influxdb
         - monasca-tempest-python3-influxdb
-        - monasca-tempest-python2-cassandra
     post:
       jobs:
         - publish-monasca-tempest-plugin-docker-image

releasenotes/notes/drop-py-2-7-e5ad0bf8a877580b.yaml

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

setup.cfg

@@ -13,10 +13,10 @@ 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
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
     Topic :: System :: Monitoring
 
 [files]

test-requirements.txt

@@ -4,8 +4,7 @@
 
 hacking>=1.1.0,<1.2.0 # 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 = py27,py35,pypy,pep8
+minversion = 3.1.1
+envlist = py37,pypy,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
 setenv =
@@ -16,15 +18,12 @@ deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHON=coverage run --source monasca_tempest_plugin --parallel-mode
@@ -35,16 +34,13 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
-basepython = python3
 commands = 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]