cleanup string formatting in modules.iptables
cleanup string formatting in modules.iptables

************* Module salt.modules.iptables
salt/modules/iptables.py:489: [E1305(too-many-format-args), check] Too many arguments for format string
salt/modules/iptables.py:527: [E1305(too-many-format-args), check_chain] Too many arguments for format string

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt