Switch to newer openstackdocstheme and reno versions

Switch to openstackdocstheme 2.2.1 and reno 3.1.0 versions. Using
these versions will allow especially:
* Linking from HTML to PDF document
* Allow parallel building of documents
* Fix some rendering problems

Update Sphinx version as well.

openstackdocstheme renames some variables, so follow the renames. A
couple of variables are also not needed anymore, remove them.

Set openstackdocs_auto_name to use project as name.

Change pygments_style to 'native' since old theme version always used
'native' and the theme now respects the setting and using 'sphinx' can
lead to some strange rendering.

See also
http://lists.openstack.org/pipermail/openstack-discuss/2020-May/014971.html

Change-Id: I129fcb2f17f7938b72fa788afa99004cc0be1d84

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.
 
-sphinx>=1.8.0,!=2.1.0 # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=2.2.1 # Apache-2.0
-reno>=2.5.0 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
 sphinxcontrib-apidoc>=0.2.0  # BSD

doc/source/conf.py

@@ -23,10 +23,9 @@ extensions = [
 ]
 
 # openstackdocstheme options
-repository_name = 'openstack/oslo.i18n'
+openstackdocs_repo_name = 'openstack/oslo.i18n'
-bug_project = 'oslo.i18n'
+openstackdocs_bug_project = 'oslo.i18n'
-bug_tag = ''
+openstackdocs_bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # The master toctree document.
 master_doc = 'index'
@@ -43,7 +42,7 @@ add_function_parentheses = True
 add_module_names = True
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 
 # -- Options for HTML output --------------------------------------------------

lower-constraints.txt

@@ -20,7 +20,7 @@ MarkupSafe==1.0
 mccabe==0.2.1
 mox3==0.20.0
 netaddr==0.7.18
-openstackdocstheme==1.18.1
+openstackdocstheme==2.2.1
 os-client-config==1.28.0
 oslo.config==5.2.0
 oslotest==3.2.0
@@ -32,14 +32,14 @@ python-mimeparse==1.6.0
 python-subunit==1.0.0
 pytz==2013.6
 PyYAML==3.12
-reno==2.5.0
+reno==3.1.0
 requests==2.14.2
 requestsexceptions==1.2.0
 rfc3986==0.3.1
 six==1.10.0
 smmap==0.9.0
 snowballstemmer==1.2.1
-Sphinx==1.8.0
+Sphinx==2.0.0
 sphinxcontrib-websupport==1.0.1
 stestr==2.0.0
 stevedore==1.20.0

releasenotes/source/conf.py

@@ -40,10 +40,10 @@ extensions = [
 ]
 
 # openstackdocstheme options
-repository_name = 'openstack/oslo.i18n'
+openstackdocs_repo_name = 'openstack/oslo.i18n'
-bug_project = 'oslo.i18n'
+openstackdocs_bug_project = 'oslo.i18n'
-bug_tag = ''
+openstackdocs_bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
+openstackdocs_auto_name = False
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -98,7 +98,7 @@ exclude_patterns = []
 # show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []