Return hydrated net info from novanet add/remove_fixed_ip calls

Compute manager expects hydrated network info from network_api

Change-Id: I36e48742144555004cbd1f71429a943c7e2952b0
Closes-bug: #1350846
Add unit test to aggregate api

Add unit test to aggregate update api.

Change-Id: Iecaacdec726200ecd6e486e02474280f7e9e4c57
Merge "Add unit test to aggregate api"
Merge "Return hydrated net info from novanet add/remove_fixed_ip calls"