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
- Update requirements, no need for python_version anymore
- Use newer openstackdocstheme and Sphinx versions
- Remove install_command from tox.ini, the default is fine

Change-Id: I43c3b5653289753da4fb1d2b6db5b03336b42d67

requirements.txt

@@ -1,4 +1,4 @@
 pbr>=2.0.0,!=2.1.0 # Apache-2.0
-openstackdocstheme>=1.20.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
+openstackdocstheme>=2.0.0 # Apache-2.0
+sphinx>=2.0.0,!=2.1.0 # BSD
 yasfb>=0.5.1

setup.cfg

@@ -5,20 +5,9 @@ description-file =
     README.rst
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
-home-page = https://git.openstack.org/cgit/openstack/masakari-specs
+home-page = https://opendev.org/openstack/masakari-specs
 classifier =
     Environment :: OpenStack
     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

@@ -8,7 +8,6 @@ basepython = python3
 usedevelop = True
 setenv =
   VIRTUAL_ENV={envdir}
-install_command = pip install -U {opts} {packages}
 deps =
   -r{toxinidir}/requirements.txt