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 and Sphinx versions
- Remove install_command from tox.ini, the default is fine

Change-Id: I4980bac7a558a291963270de592078f1a3af1111

doc/requirements.txt

@@ -1,4 +1,4 @@
-pbr>=0.11
+pbr>=2.0,!=2.1
-openstackdocstheme
+openstackdocstheme>=2.0
-sphinx>=1.6.5
+sphinx>=2.0
 yasfb>=0.5.1

doc/source/conf.py

@@ -24,7 +24,7 @@ extensions = [
 
 # openstackdocstheme settings
 repository_name = 'openstack/constellations'
-bug_project = '987'
+use_storyboard = True
 version = ''
 release = ''
 

setup.cfg

@@ -11,14 +11,3 @@ classifier =
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-
-[pbr]
-warnerrors = True
-
-[upload_sphinx]
-upload-dir = doc/build/html

tox.ini

@@ -6,7 +6,6 @@ skipsdist = True
 [testenv]
 usedevelop = True
 basepython = python3
-install_command = pip install -U {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
 deps =