Insert iptables rules, don't append them

Since the last rule set it to REJECT everything which hasn't
previously matched, appending rules after that does not work. We
should put them at the top instead.

Change-Id: If2a7ae8f94f192c953fced52693cffba680affc3
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1064255
Signed-off-by: Ryan Barry <rbarry@redhat.com>