Enhance rescope token test using v3

There was a problem in Keystone recently where revoking a token
derived from another token caused the original token to be
revoked, so adding a test here to validate it continues to work
as expected.

Change-Id: Ifd210e49c3e15721264eb47eed453889d4e35942
Updated from global requirements

Change-Id: Ide93c9d889f308b221e51a7baf0958e3cb7246ed
Merge "Enhance rescope token test using v3"
Merge "Updated from global requirements"