packaging: setup: hostname: correct interfaces RE

There was a tiny bug in http://gerrit.ovirt.org/18962 - it caused
some interface names to not be recognized. Fixed.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1009990
Change-Id: Id19851ac46307f413ddd7cb56c3f6d1d6c5627bf
Signed-off-by: Yedidyah Bar David <didi@redhat.com>