base / iptables / kojibuilder: allow port 80 on new s390x cache instance
    
    Moving the local to s390x cache from 07 (a zvm instance) to 24 (a kvm
    instance) needs to adjust the firewalls for those builders to know that
    they can use port 80 on the new one. After that we will update dns to
    point it to the new location.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>