webadmin: Host interface manual refresh

- Fixed issue where the refresh would cause a scrollbar
  to appear when manually refreshing the HostInterface
- Added manual refresh event being fired when the user
  clicks the refresh button on the top right of the grid.

Change-Id: I3e38c077a6eeef335fe1f8e8f468c70a5ca8ad92
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=967546
Signed-off-by: Alexander Wels <awels@redhat.com>