Cleanup py27 support

This repo is now testing only with Python 3, so let's make
a few cleanups:
- Remove python 2.7 stanza from setup.py
- Add requires on python >= 3.6 to setup.cfg so that pypi and pip
  know about the requirement
- Remove obsolete sections from setup.cfg
- Update classifiers
- Update requirements, no need for python_version anymore
- Use newer openstackdocstheme version
- Add basepython to tox.ini

Change-Id: I4b731354119ebc3a7519da420121404aa2fbb640

doc/requirements.txt

@@ -1,7 +1,6 @@
 # this is required for the docs build jobs
-sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
-openstackdocstheme>=1.29.2 # Apache-2.0
+sphinx>=1.8.0,!=2.1.0 # BSD
+openstackdocstheme>=1.31.2 # Apache-2.0
 reno>=2.11.3 # Apache-2.0
 doc8>=0.8.0 # Apache-2.0
 bashate>=0.6.0 # Apache-2.0

lower-constraints.txt

@@ -49,7 +49,7 @@ msgpack==0.5.6
 munch==2.2.0
 netaddr==0.7.18
 netifaces==0.10.6
-openstackdocstheme==1.20.0
+openstackdocstheme==1.31.2
 openstacksdk==0.36.0
 os-client-config==1.29.0
 os-net-config==7.1.0

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/tripleo-validations/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,6 +14,8 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
+    Programming Language :: Python :: Implementation :: CPython
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
@@ -33,25 +36,3 @@ data_files =
     share/openstack-tripleo-validations/callback_plugins = callback_plugins/*
     share/openstack-tripleo-validations/lookup_plugins = lookup_plugins/*
     share/openstack-tripleo-validations/library = library/*
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html
-
-[compile_catalog]
-directory = tripleo-validations/locale
-domain = tripleo-validations
-
-[update_catalog]
-domain = tripleo-validations
-output_dir = tripleo-validations/locale
-input_file = tripleo-validations/locale/tripleo-validations.pot
-
-[extract_messages]
-keywords = _ gettext ngettext l_ lazy_gettext
-mapping_file = babel.cfg
-output_file = tripleo-validations/locale/tripleo-validations.pot

setup.py

@@ -13,17 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
     setup_requires=['pbr>=2.0.0'],
     pbr=True)

test-requirements.txt

@@ -2,13 +2,12 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-openstackdocstheme>=1.20.0 # Apache-2.0
+openstackdocstheme>=1.31.2 # Apache-2.0
 hacking>=3.0,<3.1.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
-sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
+sphinx>=1.8.0,!=2.1.0 # BSD
 oslotest>=3.2.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.0
+minversion = 3.1.1
 envlist = linters,docs,py37,molecule
 skipdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 passenv = *
 setenv =