Zabbix

A......... [DEV-2264] replaced "group by" with "distinct" in sql query when searching for item having values

Merge in ZBX/zabbix from feature/DEV-2264-5.0 to release/5.0

* commit '30ef05885344bc245fd89eb2009e12f0c5f29194':
  A......... [DEV-2264] replaced group by with distinct when searching for item having values