webadmin: Added DC ID to profiles in Edit Network

The DC ID had formerly ben set to null, so when new profiles were
added the QoS list appeared empty.

Change-Id: I07f542510323a1ff1fa77436821ebbe9216b588c
Bug-Url: https://bugzilla.redhat.com/1005548
Signed-off-by: Lior Vernia <lvernia@redhat.com>