Zabbix

........S. [ZBX-15998] improved performance of "Remove host", "Remove from host group", "Unlink from template" operations when processing network discovery events and using MySQL database

* commit 'b20723643d6f95bf1a906f232f2912b7477928e2':
  ........S. [ZBX-15998] style fix
  ........S. [ZBX-15998] removed redundant code
  .......... [ZBX-15998] fixed discovery without proxy
  .......... [ZBX-15998] style fix
  ........S. [ZBX-15998] improved performance of "Remove host", "Remove from host group", "Unlink from template" operations when processing network discovery events
  .......... [ZBX-15998] created new development branch