Speedup Security.ReadServiceSettings (bnc#890349)

 * Drop use of deprecated Service.EnabledServices
 * Avoid 3 unnecessary calls to SystemdService.all
 * Drop obsolete runlevel parameter from some methods
Changelog and version updates
Merge pull request #10 from ancorgs/speedup_read_service_settings

Speedup Security.ReadServiceSettings (bnc#890349)