restapi: Add subcollections for network resource

The patch adds the vnicprofiles and permissions subcollections
for a single network resource.

Change-Id: I8b8d8b144dcac69d5355bd26f8ffacb9e0fdfc62
Bug-Url: https://bugzilla.redhat.com/1003881
Signed-off-by: Moti Asayag <masayag@redhat.com>