Stop testing python 2

Since it's no longer supported past Train, lets stop
running the tests.
Please also see the related neutron patch:
I1c171ab906a3b4c66558163ad26947ebf710a276

Change-Id: Iea431ea4cd56400d0867bdb4212f1c72f7cf6c72

.zuul.yaml

@@ -1,6 +1,5 @@
 - project:
     templates:
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
-      - openstack-python3-train-jobs
+      - openstack-python3-ussuri-jobs
       - check-requirements

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 :: 3.6
     Programming Language :: Python :: 3.7

tox.ini

@@ -1,10 +1,11 @@
 [tox]
-envlist = py27,py37,pep8
+envlist = py37,pep8
 minversion = 2.0
 skipsdist = True
 
 [testenv]
 install_command = pip install {opts} {packages}
+basepython = python3
 setenv = VIRTUAL_ENV={envdir}
          PYTHONWARNINGS=default::DeprecationWarning
 passenv = TRACE_FAILONLY GENERATE_HASHES http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
@@ -26,7 +27,6 @@ setenv = {[testenv]setenv}
 commands = false
 
 [testenv:functional]
-basepython = python3
 setenv = {[testenv]setenv}
          {[testenv:common]setenv}
          OS_TEST_PATH=./vmware_nsxlib/tests/functional
@@ -36,7 +36,6 @@ deps =
   -r{toxinidir}/vmware_nsxlib/tests/functional/requirements.txt
 
 [testenv:dsvm-functional]
-basepython = python3
 setenv = {[testenv]setenv}
          OS_SUDO_TESTING=1
          OS_FAIL_ON_MISSING_DEPS=1
@@ -53,7 +52,6 @@ sitepackages = True
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:pep8]
-basepython = python3
 deps =
   {[testenv]deps}
 commands =
@@ -70,7 +68,6 @@ deps = -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/
 commands = bandit -r vmware_nsxlib -n 5 -ll
 
 [testenv:cover]
-basepython = python3
 commands =
   python setup.py test --coverage --coverage-package-name=vmware_nsxlib --testr-args='{posargs}'
   coverage report
@@ -79,7 +76,6 @@ commands =
 commands = {posargs}
 
 [testenv:docs]
-basepython = python3
 deps = -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
        -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -b html doc/source doc/build/html
@@ -108,7 +104,6 @@ commands =
     check-uuid --fix
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt