packaging: setup: disable firewalld in early misc stage

otopi disables firewalld just before enabling iptables.
We need to disable firewalld before entering misc stage
because otherwise libvirt will rely on it also if it's
stopped just after libvirt is started.

Change-Id: Id74fcb192e09d27154d87ae8529a9722ae80a772
Bug-Url: https://bugzilla.redhat.com/1057139
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>