[Fedora] Add package_installed OVAL templating functionality [Fedora] Include initial OVAL check if ntpd service is enabled

[Fedora] Add package_installed OVAL templating directory structure and functionality (prerequisite for the service enabled checks) [Fedora] Include initial OVAL check if ntpd service is enabled This patch adds: * possibility to create package_installed OVAL checks in automated way (based on RHEL6's checks/templates/create_package_installed.py), * OVAL checks for ntp package installed and ntpd service enabled, * and remediation for "ntpd service enabled" rule Passed basic sanity && regression testing. Please review. Thank you && Regards, Jan. -- Jan iankko Lieskovsky / Red Hat Security Technologies Team