Switch to openstackdocstheme 2.1.1 version. Using
ths version will allow parallelizing building of documents.
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_version to not version the documents.
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.
Remove 0.0.1 version from security-thread-analysis.
Change-Id: Idd9c795d97ee33e4f121c5b4b97a9ee9e38ae50e
1d5f436400