packaging: setup: Adding a dialog to let the user review iptables changes

Adding a dialog to let the user review iptables changes
before apply them.

Change-Id: I63e0eeb26d925c8c79b9c8e55da64c57ce94a3f6
Bug-Url: https://bugzilla.redhat.com/1109326
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>