Thomas Bechtold f9503f1a30 Make openstackdocstheme an optional doc dependency
stevedore is a library that is used outside of OpenStack, too. Having
a build requirement that needs something OpenStack specific makes
life in cases (eg. for downstream packagers) more difficult.
So let's make openstackdocstheme an optional requirement.

Change-Id: Ic8cc577e617e5da699f9dc43830183005bd2ee66
2017-08-23 08:31:27 +02:00
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