Moved exception raising to get_localhoist_ip

Change-Id: If2a55b844d3c6678d37a1f2598df0f229956d0d9
Fixes: rhbz#977281
Inform about support only on RHEL

Change-Id: I66fabfd64284295e1417809948db57eef1b713f0
Fixes: rhbz#975913
Merge "Moved exception raising to get_localhoist_ip"
Merge "Inform about support only on RHEL"