webadmin: network interfaces sub tab should have Link State column

The column was omitted from the table by mistake in one of the refactories.

Change-Id: I3512bf9dc9c800574f1963d46728b4d90d39a846
Bug-Url: https://bugzilla.redhat.com/909672
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>