Bump the openstackdocstheme extension to 1.20

Some options are now automatically configured by the version 1.20:
- project
- html_last_updated_fmt
- latex_engine
- latex_elements
- version
- release.

Change-Id: I2c9f7b72a52edde7b18dc66bcc8c655630b3bbc2

doc/requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=1.20.0 # Apache-2.0
 sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD
 sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD

doc/source/conf.py

@@ -33,7 +33,6 @@ extensions = [
 repository_name = 'openstack/oslo.policy'
 bug_project = 'oslo.policy'
 bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # autodoc generation is a bit aggressive and a nuisance when doing heavy
 # text edit cycles.

lower-constraints.txt

@@ -25,7 +25,7 @@ mox3==0.20.0
 msgpack-python==0.4.0
 netaddr==0.7.18
 netifaces==0.10.4
-openstackdocstheme==1.18.1
+openstackdocstheme==1.20.0
 os-client-config==1.28.0
 oslo.config==5.2.0
 oslo.context==2.22.0

releasenotes/source/conf.py

@@ -43,7 +43,6 @@ extensions = [
 repository_name = 'openstack/oslo.policy'
 bug_project = 'oslo.policy'
 bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -58,7 +57,6 @@ source_suffix = '.rst'
 master_doc = 'index'
 
 # General information about the project.
-project = u'oslo.policy Release Notes'
 copyright = u'2016, oslo.policy Developers'
 
 # Release notes do not need a version in the title, they span
@@ -194,17 +192,6 @@ htmlhelp_basename = 'oslo.policyReleaseNotesDoc'
 
 # -- Options for LaTeX output ---------------------------------------------
 
-latex_elements = {
-    # The paper size ('letterpaper' or 'a4paper').
-    # 'papersize': 'letterpaper',
-
-    # The font size ('10pt', '11pt' or '12pt').
-    # 'pointsize': '10pt',
-
-    # Additional stuff for the LaTeX preamble.
-    # 'preamble': '',
-}
-
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).