Oslo libs has been updated.

* all oslo libs has been updated;
* several useful oslo libs has been added.

Change-Id: I744076ec5b8a610002a442a8b7d6a761f381de64
Id of the NodeGroup is now hidden.

Change-Id: Ib53a7410289e278459787b34fd87b096ea388f0d
REST API / (versions) endpoint has been fixed.

Change-Id: I987ec98c562bccdc5680d60bb8ea00e0023921e6
Merge "Oslo libs has been updated."
Merge "Id of the NodeGroup is now hidden."
Merge "REST API / (versions) endpoint has been fixed."