Stop testing with py2

Python 2 is no longer supported. Python 3 is required.
This patch stops testing with Python 2 and issues the release note.

Change-Id: Ibed6cf480280dcdde19a8d47982b9e1fa6b96f85

.zuul.yaml

@@ -1,7 +1,6 @@
 - project:
     templates:
       - check-requirements
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
     check:
       jobs:
@@ -11,9 +10,6 @@
         - openstack-tox-pep8:
             required-projects:
               - openstack/nova
-        - openstack-tox-py27:
-            required-projects:
-              - openstack/nova
         - openstack-tox-py36:
             required-projects:
               - openstack/nova
@@ -28,9 +24,6 @@
         - openstack-tox-pep8:
             required-projects:
               - openstack/nova
-        - openstack-tox-py27:
-            required-projects:
-              - openstack/nova
         - openstack-tox-py36:
             required-projects:
               - openstack/nova

releasenotes/notes/drop-python2-406d4474c1cf9cf9.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    Python 2 is no longer supported. Python 3 is required.

setup.cfg

@@ -5,8 +5,6 @@ description-file = README.rst
 license = Apache Software License
 classifiers =
     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

test-requirements.txt

@@ -7,7 +7,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 nose>=1.3.7 # LGPL
 mock>=2.0.0 # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
 sphinxcontrib-httpdomain>=1.3.0 # BSD
 
 fixtures>=3.0.0 # Apache-2.0/BSD

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-envlist = py27,py36,py37,pep8
-minversion = 2.0
+envlist = py36,py37,pep8
+minversion = 3.1.1
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
 deps = -r{toxinidir}/test-requirements.txt
@@ -16,15 +18,12 @@ commands =
 sitepackages = False
 
 [testenv:cover]
-basepython = python3
 commands = python setup.py testr --coverage --testr-args="{posargs}"
 
 [testenv:pep8]
-basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [flake8]
@@ -33,7 +32,6 @@ builtins = _
 exclude = .venv,.git,.tmp,.tox,dist,doc,*lib/python*,*egg,tools
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt