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.

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.

Remove docs requirements from lower-constraints, they are not needed
during install or test but only for docs building.

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

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

Change-Id: I9845c13f4d87c755c56922d3a7fba9a8adfbfb18

doc/requirements.txt

@@ -1,3 +1,3 @@
-openstackdocstheme>=1.20.0 # Apache-2.0
-reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
+openstackdocstheme>=2.2.1 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
+sphinx>=2.0.0,!=2.1.0 # BSD

doc/source/conf.py

@@ -40,9 +40,9 @@ master_doc = 'index'
 copyright = u'2013, OpenStack Foundation'
 
 # openstackdocstheme options
-repository_name = 'openstack/kuryr'
-bug_project = 'kuryr'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/kuryr'
+openstackdocs_bug_project = 'kuryr'
+openstackdocs_bug_tag = ''
 
 # If true, '()' will be appended to :func: etc. cross-reference text.
 add_function_parentheses = True
@@ -52,7 +52,7 @@ 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

@@ -45,7 +45,6 @@ munch==2.1.0
 netaddr==0.7.18
 netifaces==0.10.4
 neutron-lib==1.13.0
-openstackdocstheme==1.20.0
 openstacksdk==0.11.2
 os-client-config==1.28.0
 os-service-types==1.2.0
@@ -87,7 +86,6 @@ python-neutronclient==6.7.0
 python-subunit==1.0.0
 pytz==2013.6
 PyYAML==3.12
-reno==2.5.0
 repoze.lru==0.7
 requests==2.14.2
 requestsexceptions==1.2.0
@@ -96,8 +94,6 @@ Routes==2.3.1
 simplejson==3.5.1
 six==1.10.0
 snowballstemmer==1.2.1
-Sphinx==1.6.2
-sphinxcontrib-websupport==1.0.1
 SQLAlchemy==1.0.10
 sqlalchemy-migrate==0.11.0
 sqlparse==0.2.2

releasenotes/source/conf.py

@@ -54,9 +54,9 @@ master_doc = 'index'
 copyright = u'2016, Kuryr developers'
 
 # openstackdocstheme options
-repository_name = 'openstack/kuryr'
-bug_project = 'kuryr'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/kuryr'
+openstackdocs_bug_project = 'kuryr'
+openstackdocs_bug_tag = ''
 
 # Release notes do not need a version number in the title, they
 # cover multiple releases.
@@ -106,7 +106,7 @@ exclude_patterns = ['_build']
 # 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 = []