run.sh: fix critical error that prevents cleanup

Change-Id: Id7e1b05716ecf4e773410e277aa18ac86b1feb95
add iptables-services rpm to rhel, req rhel7

RHEL7 stage job is failing due to iptables not starting.

/Stage[main]/Firewall::Linux::Redhat/Service[iptables]/ensure:
change from stopped to running failed: Could not start
Service[iptables]: Execution of '/sbin/service iptables start

Change-Id: I0ce2efb0916afae1c9c3d24b8b9b0422a89cdb71
rhel7 iptable service workaround enable only if flag is set

Change-Id: I4d8868c9ae9476952bfc48d03113e39dc0b0fe1b
run.sh: Fix critical error when skipping tags

Change-Id: I8bf751aded638286de877b82a248040d440d8802