webadmin: [Labels] SetupNetwork emphasize unconfigured interface

Network which is in fact not attached to the interface (but has the same
label as the interface) looks like attached in Setup Networks dialog.

Change-Id: Ifa83ddfd2ceddc8f2227dcc8cc36c721baf8c7bc
Bug-Url: https://bugzilla.redhat.com/1067928
Bug-Url: https://bugzilla.redhat.com/1065270
Bug-Url: https://bugzilla.redhat.com/1068267
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>