* Populate doc build timestamp
* Fix the title of reference/user.rst as openstackdocstheme does not
handle a title string with backquoted string in the nav icons.
* Remove unnecessary build configurations (manpage, latex, texinfo)
* Remove the heading "Indices and tables" in index.rst.
It simplifies the toc of the top page.
Change-Id: If35bd99ee203105418ea49eb921b2d6d428e0187
43c6e3157c