webadmin: Host network interface subtab data

- Fixed issue where when pressing refresh on the main tab
  grid, and the network interface subtab was open the data
  for the subtab would disappear.

Change-Id: Ibb539f95353992f589d251629be76f02a0196d18
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1066827
Signed-off-by: Alexander Wels <awels@redhat.com>