Store groups ids objects list in the OS-FEDERATION object.

When issuing unscoped federated token store groups ids
object in the OS-FEDERATION objects instead of standalone
OS-FEDERATION:groups.

Change-Id: I116466c6eefae674d2245796dfd608b12d5d3e6d
Closes-Bug: #1294150
Merge "Store groups ids objects list in the OS-FEDERATION object."