Switch to newer openstackdocstheme and reno versions

Switch to openstackdocstheme 2.2.0 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

Update Sphinx version as well.

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.

Set openstackdocs_auto_name to use 'project' as name.

Depends-On: https://review.opendev.org/728938
Change-Id: I4f21de08de3bfd89bf8e331b6c819932cde8ca2f

doc/requirements.txt

@@ -2,6 +2,6 @@
 # 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
-reno>=2.5.0 # Apache-2.0
+openstackdocstheme>=2.2.0 # Apache-2.0
+sphinx>=2.0.0,!=2.1.0 # BSD
+reno>=3.1.0 # Apache-2.0

doc/source/conf.py

@@ -28,9 +28,9 @@ extensions = [
 ]
 
 # openstackdocstheme options
-repository_name = 'openstack/oslo.service'
-bug_project = 'oslo.service'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/oslo.service'
+openstackdocs_bug_project = 'oslo.service'
+openstackdocs_bug_tag = ''
 
 # autodoc generation is a bit aggressive and a nuisance when doing heavy
 # text edit cycles.

lower-constraints.txt

@@ -26,7 +26,6 @@ mox3==0.20.0
 msgpack-python==0.4.0
 netaddr==0.7.18
 netifaces==0.10.4
-openstackdocstheme==1.18.1
 os-client-config==1.28.0
 oslo.concurrency==3.25.0
 oslo.config==5.1.0
@@ -47,7 +46,6 @@ python-mimeparse==1.6.0
 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
@@ -57,8 +55,6 @@ Routes==2.3.1
 six==1.10.0
 smmap==0.9.0
 snowballstemmer==1.2.1
-Sphinx==1.8.0
-sphinxcontrib-websupport==1.0.1
 stestr==2.0.0
 stevedore==1.20.0
 testtools==2.2.0

releasenotes/source/conf.py

@@ -40,9 +40,10 @@ extensions = [
 ]
 
 # openstackdocstheme options
-repository_name = 'openstack/oslo.service'
-bug_project = 'oslo.service'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/oslo.service'
+openstackdocs_bug_project = 'oslo.service'
+openstackdocs_bug_tag = ''
+openstackdocs_auto_name = False
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']