[RHEL/7] Modify service_enabled template file so it would work against systemd
[RHEL/7] Create package_iptables-services_installed OVAL check
         (this is a prerequisite for RHEL/7 services_enabled check
         for iptables & ip6tables service since in RHEL7 both of
         these services has been moved to iptables-service package)
[RHEL/7] Create initial form of services_enabled.csv file for RHEL-7
[RHEL/7] Create RHEL-7 services enabled OVAL checks for iptables & ip6tables services
[RHEL/7] Update RHEL-7 XCCDF test stamps for service ip{,6}tables enabled checks
[RHEL/7] Switch on service ip{,6}tables enabled checks in RHT-CCP profile