Switch from oslosphinx to openstackdocstheme

As part of the docs migration work[0] for Pike we need to switch to use the
openstackdocstheme.

[0]https://review.openstack.org/#/c/472275/

Change-Id: I66ea11e32ec9736e2376027863723c19c07a32fb

releasenotes/source/conf.py

@@ -23,6 +23,9 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import openstackdocstheme
+import pbr.version
+
 # 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.
@@ -37,7 +40,6 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'oslosphinx',
     'reno.sphinxext',
 ]
 
@@ -62,7 +64,6 @@ copyright = u'2015, OpenStack-Ansible Developers'
 # built documents.
 #
 # The short X.Y version.
-import pbr.version
 version_info = pbr.version.VersionInfo('openstack-ansible-plugins')
 # The full version, including alpha/beta/rc tags.
 release = version_info.version_string_with_vcs()
@@ -112,7 +113,7 @@ pygments_style = 'sphinx'
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
+html_theme = 'openstackdocs'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -120,7 +121,7 @@ html_theme = 'default'
 # html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-# html_theme_path = []
+html_theme_path = [openstackdocstheme.get_html_theme_path()]
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".