Fix endpoint URIs

The endpoint PATCH and DELETE URIs were incorrect -
v3/{endpoint_id} is not a valid resource. These should be
v3/endpoints/{endpoint_id}.

Change-Id: Ia354f5cb66f9185e14321c9bfa3cc41df4f89369
Fix v3 versions response

The v3 versions response has "v3.0" for the "id".

Also, it doesn't have links to docs.

Change-Id: I8677022a955fcc98d9511860b7d28bce9ae7d5fb
Merge "Fix endpoint URIs"
Merge "Fix v3 versions response"