webadmin: Sort NIC column in Network/Hosts subtab

Since the column comprises not only text but possibly a label icon, it
was not enough to use the default text sorting.

Change-Id: Ie52ec4faafbb06a6cd62b988edc11d32db3bb765
Bug-Url: https://bugzilla.redhat.com/1120054
Signed-off-by: Lior Vernia <lvernia@redhat.com>