identity version resource and version fixes

Support for identity version and various version fixes:
* Added the notion of an unversioned service for a resource like the version
  resource.
* Changed all of the service filters so they could pass version through.
* Changed all the version resources to use unversioned services.

Change-Id: I92d6be9661560a8ced2648f1605fc3ffd8eeb91c
Merge "identity version resource and version fixes"