webadmin: Labeled Networks with vlan shown outside the label group

Due to a bug (the claculation of the nic labels was done for all the nics
and not just the physical nic), in setup networks dialog labeled networks
with vlan were attached to the correct nic but were outside the label
group.

Change-Id: Iefbe55854ac5b4cad6c8ab79b93edf5500fb0a81
Bug-Url: https://bugzilla.redhat.com/1067928
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>