Fix operation on clouds with availability-zones

In a cloud with AZs, you can get multiple entries back from the service
catalog - one for each AZ and then one that is AZ agnostic that's tied
to the region. If the region_name is plumbed all the way through, this
works as intended.

Change-Id: I3b365ea306e8111fc80830672ae8080a5d1dc8e0
Remove 'links' section from several v3 Identity objects

The links field in the returned objects from the v3 Identity
API aren't really useful, so let's remove them.
Managed to remove most of them from the core API.
I'll likely remove the extension/contribution (oauth/federation)
related ones in another patch.

Also in this patch the code for setting services and projects
was changed. Though not incorrect, it was not needed to copy
the entire returned object, we should just need to pass in
the fields we want to update.

Change-Id: I164ca9ad8b28fa10b291e9115ef40753e387c547
Merge "Remove 'links' section from several v3 Identity objects"
Merge "Fix operation on clouds with availability-zones"