AMBARI-5799. Add filter by regex and sort capabilities to API. (swagle)
AMBARI-5834. After upgraded to 1.6.0, Nagios server cannot start. (swagle)
AMBARI-5799. Add filter by regex and sort capabilities to API. Change operator from filter to matches. (swagle)
AMBARI-5799. Add filter by regex and sort capabilities to API. Unit test fix. (swagle)