Drop python2 support and testing

Change-Id: I1ce77e223674013754408b2db42b1fb6e80bb32b

.zuul.yaml

@@ -39,8 +39,7 @@
       devstack_plugins:
         neutron: https://opendev.org/openstack/neutron.git
       devstack_localrc:
-        # TODO(sean-k-mooney) move all tempest jobs to py3 by default.
-        # USE_PYTHON3: true
+        USE_PYTHON3: true
         FORCE_CONFIG_DRIVE: true
         ENABLE_VOLUME_MULTIATTACH: true
         # NOTE(sean-k-mooney) we do not have to set
@@ -118,7 +117,6 @@
     templates:
       - check-requirements
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

playbooks/os-vif-ovs/run.yaml

@@ -27,6 +27,7 @@
         cmd: |
           set -e
           set -x
+          export DEVSTACK_GATE_USE_PYTHON3=true
           export PYTHONUNBUFFERED=true
           export DEVSTACK_GATE_TEMPEST=1
           export DEVSTACK_GATE_TEMPEST_FULL=1

releasenotes/notes/drop-python2-support-7a4bc7d31253c1e5.yaml

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

setup.cfg

@@ -5,6 +5,7 @@ description-file = README.rst
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/os-vif/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -12,11 +13,11 @@ 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 :: Only
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: Implementation :: CPython
 
 [files]
 packages =

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1.1
-envlist = py37,py27,pep8
+envlist = py37,pep8
 skipsdist = True
 ignore_basepython_conflict = True
 
@@ -29,13 +29,6 @@ deps =
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/doc/requirements.txt
 
-[testenv:functional-py27]
-basepython = python2.7
-setenv =
-    {[testenv]setenv}
-commands =
-    stestr run --black-regex ".tests.unit" '{posargs}'
-
 [testenv:functional]
 setenv =
     {[testenv]setenv}