Treat RHEL 7 and later like Fedora w/r/t iptables #338
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RHEL 7 replaces legacy init with systemd, and must be treated like
Fedora w/r/t iptables persistence. This patches checks
operatingsystemrelease in addition to operatingsystem in order
to differentiate between RHEL 7 and earlier releases.
Both RHEL 7 and recent Fedora releases require the iptables-services
package to support the commands in lib/puppet/util/firewall.rb.
This also corrects the path to /usr/libexec/iptables/iptables.init.