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: Ic79023863c3b40c496538d9eb038ebeba2962070

releasenotes/source/conf.py

@@ -20,6 +20,8 @@
 
 # -- General configuration ------------------------------------------------
 
+import openstackdocstheme
+
 # If your documentation needs a minimal Sphinx version, state it here.
 #needs_sphinx = '1.0'
 
@@ -27,7 +29,6 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'oslosphinx',
     'reno.sphinxext',
 ]
 
@@ -99,7 +100,7 @@ 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
@@ -107,7 +108,7 @@ 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".

test-requirements.txt

@@ -1,6 +1,6 @@
 # This is required for the docs build jobs
 sphinx!=1.6.1,>=1.5.1 # BSD
-oslosphinx>=4.7.0  # Apache-2.0
+openstackdocstheme>=1.5.0 # Apache-2.0
 
 # This is required for the releasenotes build jobs
 # FIXME: reno is manually pinned to !=2.0.0 because of bug #1651995