webadmin: Fix visual regression in Setup Networks

When refactoring I caused the required/non-required labels to
disappear, this fixes it.

Change-Id: If6ca63f1140c5519425fac7910a35127f367da4b
Bug-Url: https://bugzilla.redhat.com/1026225
Signed-off-by: Lior Vernia <lvernia@redhat.com>