Drop python 2.7 support and testing

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

senlin-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: I53e47c4cf7446c38eb47ad1c889483197a3d8698

.zuul.yaml

@@ -4,21 +4,14 @@
       - tempest-plugin-jobs
     check:
       jobs:
-        - senlin-dsvm-tempest-py27-api
-        - senlin-dsvm-tempest-py35-api:
+        - senlin-dsvm-tempest-py3-api
+        - senlin-tempest-api-ipv6-only
+        - senlin-dsvm-tempest-py3-functional
+        - senlin-dsvm-tempest-py3-integration:
             voting: false
-            branches: ^(?!stable/newton).*$
-        - senlin-dsvm-tempest-py27-functional
-        - senlin-dsvm-tempest-py35-functional:
-            voting: false
-            branches: ^(?!stable/newton).*$
-        - senlin-dsvm-tempest-py27-integration:
-            voting: false
-        - senlin-dsvm-tempest-py35-integration:
-            voting: false
-            branches: ^(?!stable/newton).*$
     gate:
       queue: senlin
       jobs:
-        - senlin-dsvm-tempest-py27-api
-        - senlin-dsvm-tempest-py27-functional
+        - senlin-dsvm-tempest-py3-api
+        - senlin-tempest-api-ipv6-only
+        - senlin-dsvm-tempest-py3-functional

releasenotes/notes/drop-py-2-7-e5ce9dcd388e9e1e.yaml

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

setup.cfg

@@ -13,10 +13,9 @@ 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
 
 [global]
 setup-hooks =

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.0
-envlist = py35,py27,pep8,api,functional
+minversion = 3.1.1
+envlist = py37,pep8,api,functional
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
@@ -14,7 +16,6 @@ commands =
 whitelist_externals = find
 
 [testenv:api]
-basepython = python3.5
 setenv = VIRTUAL_ENV={envdir}
          PYTHONHASHSEED=0
          OS_TEST_PATH=senlin_tempest_plugin/api
@@ -23,7 +24,6 @@ commands =
     ostestr --slowest --regex 'senlin_tempest_plugin.tests.api.*' {posargs}
 
 [testenv:functional]
-basepython = python3.5
 setenv = VIRTUAL_ENV={envdir}
          PYTHONHASHSEED=0
          OS_TEST_PATH=senlin_tempest_plugin/functional
@@ -37,16 +37,13 @@ commands =
 whitelist_externals = find
 
 [testenv:pep8]
-basepython = python3
 commands =
     flake8 senlin_tempest_plugin
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:releasenotes]
-basepython = python3
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [flake8]