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.

Set openstackdocs_pdf_link to link to PDF file. Note that
the link to the published document only works on docs.openstack.org
where the PDF file is placed in the top-level html directory. The
site-preview places the PDF in a pdf directory.

Disable openstackdocs_auto_name to use 'project' variable 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.

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: Ie14b87a1e67a7b4351f17a2f0687bcfe5a4b2133

doc/requirements.txt

@@ -2,5 +2,5 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-openstackdocstheme>=1.31.2 # Apache-2.0
-sphinx>=1.8.0,!=2.1.0 # BSD
+openstackdocstheme>=2.2.1 # Apache-2.0
+sphinx>=2.0.0,!=2.1.0 # BSD

doc/source/conf.py

@@ -68,7 +68,7 @@ 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 man page output --------------------------------------------
 
@@ -116,6 +116,8 @@ latex_elements = {
 # intersphinx_mapping = {'http://docs.python.org/': None}
 
 # openstackdocstheme options
-repository_name = 'openstack/watcher-dashboard'
-bug_project = 'watcher-dashboard'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/watcher-dashboard'
+openstackdocs_pdf_link = True
+openstackdocs_auto_name = False
+openstackdocs_bug_project = 'watcher-dashboard'
+openstackdocs_bug_tag = ''

lower-constraints.txt

@@ -43,7 +43,6 @@ msgpack==0.5.6
 munch==2.2.0
 netaddr==0.7.19
 netifaces==0.10.6
-openstackdocstheme==1.31.2
 openstacksdk==0.12.0
 os-client-config==1.29.0
 os-service-types==1.2.0
@@ -78,7 +77,6 @@ python-watcherclient==1.1.0
 pytz==2018.3
 PyYAML==3.12
 rcssmin==1.0.6
-reno==2.5.0
 requests==2.18.4
 requestsexceptions==1.4.0
 rfc3986==1.1.0
@@ -87,8 +85,6 @@ selenium==2.50.1
 semantic-version==2.6.0
 simplejson==3.13.2
 snowballstemmer==1.2.1
-Sphinx==1.6.2
-sphinxcontrib-websupport==1.0.1
 stevedore==1.28.0
 testscenarios==0.4
 testtools==2.2.0

releasenotes/source/conf.py

@@ -93,7 +93,7 @@ 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 = []
@@ -109,9 +109,10 @@ pygments_style = 'sphinx'
 html_theme = 'openstackdocs'
 
 # openstackdocstheme options
-repository_name = 'openstack/watcher-dashboard'
-bug_project = 'watcher-dashboard'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/watcher-dashboard'
+openstackdocs_auto_name = False
+openstackdocs_bug_project = 'watcher-dashboard'
+openstackdocs_bug_tag = ''
 
 # 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

test-requirements.txt

@@ -12,7 +12,3 @@ testtools>=2.2.0 # MIT
 # This also needs xvfb library installed on your OS
 xvfbwrapper>=0.1.3 #license: MIT
 
-# Doc requirements
-openstackdocstheme>=1.31.2 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2  # BSD
-reno>=2.5.0 # Apache-2.0