Update release notes doc theme

Change-Id: Iadb4a7a1eba5b564c6121f02eb616e52f7f2adf2

releasenotes/source/conf.py

@@ -38,10 +38,15 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'oslosphinx',
+    'openstackdocstheme',
     'reno.sphinxext',
 ]
 
+# openstackdocstheme options
+repository_name = 'openstack/neutron-lbaas'
+bug_project = 'octavia'
+bug_tag = 'doc'
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 
@@ -112,7 +117,7 @@ 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
@@ -151,6 +156,7 @@ html_static_path = ['_static']
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.
 # html_last_updated_fmt = '%b %d, %Y'
+html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.

test-requirements.txt

@@ -11,6 +11,7 @@ python-subunit>=0.0.18 # Apache-2.0/BSD
 requests-mock>=1.1.0 # Apache-2.0
 sphinx>=1.6.2 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
+openstackdocstheme>=1.17.0 # Apache-2.0
 oslo.concurrency>=3.20.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD