Cleanup py27 support

This repo is now testing only with Python 3, so let's make
a few cleanups:
- Remove obsolete sections from setup.cfg
- Cleanup doc/source/conf.py to remove now obsolete content.
- Use newer openstackdocstheme version
- Remove hacking from requirements, it's required in tox.ini already

Change-Id: Ie5d87c62cca191c345bc273e9e43415ec4501df7

doc/source/conf.py

@@ -7,14 +7,11 @@
 # serve to show the default.
 
 import datetime
-import subprocess
-import sys
-import os
 
 # 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.
-sys.path.insert(0, os.path.abspath('.'))
+# sys.path.insert(0, os.path.abspath('.'))
 
 # -- General configuration -----------------------------------------------------
 

requirements.txt

@@ -1,7 +1,6 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-hacking
 jsonschema
 requests
 PyYAML>=3.10.0  # MIT
-openstackdocstheme>=1.20.0  # Apache-2.0
-sphinx>=1.5.1  # BSD
+openstackdocstheme>=1.31.2  # Apache-2.0
+sphinx>=1.6.1  # BSD

setup.cfg

@@ -12,11 +12,3 @@ classifier =
     Intended Audience :: System Administrators
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
-
-[egg_info]
-tag_build =
-tag_date = 0
-tag_svn_revision = 0
-
-[wheel]
-universal = 1