restapi: support for adding network QoS

Adding a NETWORK type for QoS entity, and adding it
to current QoS infra.

Adding QoS to Vnic Profile entity.

Change-Id: I5104c61b484683fbee0ead9a9d0934ec93a6c4cd
Bug-Url: https://bugzilla.redhat.com/1078863
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>