webadmin: Allow editing host network when part of label

Previously the edit button was invisible, now it is shown. Note that
when a network is unmanaged, the "action button" in that case would
remove the network from the interface, which would then "break" the
label, therefore it is not displayed.

Change-Id: I933eb0900f5a1663a5ae4f52eb05208e6db2c868
Bug-Url: https://bugzilla.redhat.com/1055952
Signed-off-by: Lior Vernia <lvernia@redhat.com>