Add all files for RST conversion of security-guide. The guide will
be published to docs.openstack.org/draft/security-guide-rst while
conversion happens.
Translations are currently disabled for this guide during the
conversion.
Add tooling so that the guide gets build automatically.
Add initial content. Note that the files in the imported directory will
be imported from openstack-manuals automatically once this change is in,
they are stubs right now to have this building.
Change-Id: Id5fc16d3a3c8e2efa98eb3fd7f5c986e0a83a76b
a09598585f