rhevh7-install: replace firewalld to iptables

host-deploy uses iptables instead of firewalld.

Change-Id: I26e7e86b471c5fa82deb08fa8a25aaa0f89fdaf0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1150328
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>