Cleanup Python 2.7 support

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

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 section from setup.cfg: Wheel is not needed for python
  3 only repo
- Remove ancient sections from setup.cfg
- Update requirements
- Update api-ref/source/conf.py for current openstackdocstheme
- Don't test for broken po files, this is done in the infra scripts
  since a long time
- Change shebang lines to use python3

Change-Id: If5276a47b8822c5c19d045fbc5c41394f4a9dd2d

api-ref/source/conf.py

@@ -25,8 +25,6 @@
 import os
 import sys
 
-import openstackdocstheme
-
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
@@ -41,14 +39,13 @@ sys.path.insert(0, os.path.abspath('./'))
 
 extensions = [
     'os_api_ref',
+    'openstackdocstheme'
 ]
 
 html_theme = 'openstackdocs'
-html_theme_path = [openstackdocstheme.get_html_theme_path()]
 html_theme_options = {
     "sidebar_mode": "toc",
 }
-html_context = {'bug_project': 'tacker', 'bug_tag': 'api-ref'}
 
 # The suffix of source filenames.
 source_suffix = '.rst'

doc/requirements.txt

@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4'  # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/tacker/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -104,11 +105,6 @@ oslo.policy.policies =
     # aggregate method.
     tacker = tacker.policies:list_rules
 
-[build_releasenotes]
-all_files = 1
-build-dir = releasenotes/build
-source-dir = releasenotes/source
-
 [extract_messages]
 keywords = _ gettext ngettext l_ lazy_gettext
 mapping_file = babel.cfg
@@ -122,6 +118,3 @@ domain = tacker
 domain = tacker
 output_dir = tacker/locale
 input_file = tacker/locale/tacker.pot
-
-[wheel]
-universal = 1

setup.py

@@ -16,14 +16,6 @@
 # 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)

tacker/cmd/eventlet/tacker_server.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # Copyright 2011 VMware, Inc.
 # All Rights Reserved.
 #

tools/install_venv.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2010 United States Government as represented by the
 # Administrator of the National Aeronautics and Space Administration.
@@ -22,7 +22,6 @@
 """
 Installation script for Tacker's development virtualenv
 """
-from __future__ import print_function
 
 import os
 import sys

tox.ini

@@ -47,7 +47,6 @@ commands =
   flake8
   doc8 -e .rst doc/source/ CONTRIBUTING.rst HACKING.rst README.rst TESTING.rst
   tacker-db-manage check_migration
-  bash -c "find tacker -type f -regex '.*\.pot?' -print0|xargs -0 --no-run-if-empty -n 1 msgfmt --check-format -o /dev/null"
 whitelist_externals = bash
 
 [testenv:i18n]