Remove oauth1 as an extension and move it to a core resource.
For now we leave the database migrations in the extension directory
until we have a general policy for merging these into core.
DocImpact: update keystone-paste and remove oauth1 from pipeline
Change-Id: I0ed1ec44d42c3b379a5c2a40e3e6298842dfc01d
Implements: bp move-extensions