[RHEL/7] Update RHEL-7 service_*_enabled.sh remediation fixes to
         start using # systemctl ... rather than # chkconfig ...
Merge pull request #256 from iankko/rhel7_update_service_enabled_remediation_fixes

[bugfix] [RHEL/7] Update RHEL-7 service_*_enabled.sh remediation fixes to start using # systemctl ... rather than # chkconfig ...