Zabbix

........S. [ZBX-19651] fixed problem escalation when at least one of the hosts in a trigger expression is not in maintenance

* commit '170c21a6a492ec651f730d847e7aad7a73879c25':
  .......... [ZBX-19651] added changelog
  ........S. [ZBX-19651] got rid of DCget_host_by_hostid call
  ........S. [ZBX-19651] removed redundant changes from events.c
  ........S. [ZBX-19651] reimplemented via zbx_dc_get_event_maintenances
  ........S. [ZBX-19651] fixed notification sending when problem is not in maintenance mode
  ........S. [ZBX-19651] fixed notification sending when problem is not in maintenance mode