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
before the next release removes them. 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.

Depends-On: https://review.opendev.org/729744
Change-Id: I4c81bec463bb61a559ee8941545c16a08b7041f9

doc/requirements.txt

@@ -1,6 +1,6 @@
 # The order of packages is significant, because pip processes them in the order
 # 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>=2.2.1 # Apache-2.0
-reno>=2.5.0 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD

doc/source/conf.py

@@ -15,7 +15,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import subprocess
 import sys
 
 import os
@@ -44,10 +43,9 @@ extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.todo',
               'openstackdocstheme']
 
 # openstackdocstheme options
-repository_name = 'openstack/python-saharaclient'
+openstackdocs_repo_name = 'openstack/python-saharaclient'
-bug_project = '934'
+openstackdocs_use_storyboard = True
-bug_tag = 'doc'
+openstackdocs_auto_name = False
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -65,15 +63,6 @@ master_doc = 'index'
 project = u'Sahara Client'
 copyright = u'2013, OpenStack Foundation'
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-# Version info
-from saharaclient.version import version_info as saharaclient_version
-release = saharaclient_version.release_string()
-# The short X.Y version.
-version = saharaclient_version.version_string()
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -104,7 +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 = []

releasenotes/source/conf.py

@@ -20,10 +20,9 @@ extensions = [
 ]
 
 # openstackdocstheme options
-repository_name = 'openstack/python-saharaclient'
+openstackdocs_repo_name = 'openstack/python-saharaclient'
-bug_project = '934'
+openstackdocs_use_storyboard = True
-bug_tag = 'releasenotes'
+openstackdocs_auto_name = False
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -49,7 +48,7 @@ version = ''
 exclude_patterns = []
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 
 # -- Options for HTML output ----------------------------------------------