webadmin: Host->Interfaces, shorten column width

Change-Id: Iaeda10b5b93b9b0ebde4ec69c3e7f0de80228be9
Bug-Url: https://bugzilla.redhat.com/1115310
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>
(cherry picked from commit 2a030983cd44fb3960829c1ab144f0e45b156966)