Update api-ref for openstackdocstheme 1.11

Use the new options from openstackdocstheme 1.11, update requirements
for it (syncing with global requirements file).

For details, see https://docs.openstack.org/openstackdocstheme/latest/

Change-Id: I398d0c3fdc07ed184e83c8f25ef7176eac830e30

api-ref/source/conf.py

@@ -23,24 +23,25 @@
 # serve to show the default.
 
 import os
-import subprocess
 import sys
-import warnings
 
 from octavia.version import version_info
-import openstackdocstheme
 
 extensions = [
     'os_api_ref',
+    'openstackdocstheme'
 ]
 
 
 html_theme = 'openstackdocs'
-html_theme_path = [openstackdocstheme.get_html_theme_path()]
 html_theme_options = {
-    "sidebar_mode": "toc",
+    "sidebar_dropdown": "api_ref",
+    "sidebar_mode": "toc"
 }
-html_context = {'bug_project': 'octavia', 'bug_tag': 'api-ref'}
+repository_name = 'openstack/octavia'
+bug_project = 'octavia'
+bug_tag = 'api-ref'
+
 
 # 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
@@ -151,13 +152,8 @@ pygments_style = 'sphinx'
 # 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'
-git_cmd = ["git", "log", "--pretty=format:'%ad, commit %h'", "--date=local",
+# Must set this variable to include year, month, day, hours, and minutes.
-           "-n1"]
+html_last_updated_fmt = '%Y-%m-%d %H:%M'
-try:
-    html_last_updated_fmt = subprocess.check_output(git_cmd).decode('utf-8')
-except Exception:
-    warnings.warn('Cannot get last updated time from git repository. '
-                  'Not setting "html_last_updated_fmt".')
 
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.

doc-requirements.txt

@@ -1,15 +1,16 @@
 actdiag
 blockdiag
-docutils==0.11
+docutils>=0.11
 nwdiag
 oslosphinx
 seqdiag
-sphinx==1.2.3
+sphinx>=1.6.2
 sphinxcontrib-actdiag
 sphinxcontrib-blockdiag
 sphinxcontrib-nwdiag
 sphinxcontrib-seqdiag
 graphviz
+openstackdocstheme>=1.11.0  # Apache-2.0
 
 # This needs to be installed after above modules
 pydotplus