This ensures we have version-specific references to other projects [1].
Note that this doesn't mean the URLs are actually valid - we need to do
more work (linkcheck?) here, but it's an improvement nonetheless.
[1] https://docs.openstack.org/openstackdocstheme/latest/#external-link-helper
Change-Id: Ifb99e727110c4904a85bc4a13366c2cae300b8df
Per the spec [1]:
reference/ – any reference information associated with a project that
is not covered by one of the above categories. Library projects should
place their automatically generated class documentation here.
There are a couple of documents that focus on nova internals, but won't
necessarily be applicable to user. These are moved here.
[1] specs.openstack.org/openstack/docs-specs/specs/pike/os-manuals-migration
Change-Id: I94614c2383329e1fbed60d9c5aca3fab5170ef8f