Zabbix

.......... [DEV-1833] refactored test item tests

Merge in ZBX/zabbix from feature/DEV-1833-5.2 to release/5.2

* commit '418f14a78d3bb890e55d1ac42b047a707b7dff5c':
  .......... [DEV-1833] mycro fixes after review
  .......... [DEV-1833] micro fix after review
  .......... [DEV-1833] fixed comment
  .......... [DEV-1833] fixed code after review
  .......... [DEV-1833] added SNMP test empty fields check, fixed typo
  .......... [DEV-1833] fixed annotation
  .......... [DEV-1833] removed unnecessary variables
  .......... [DEV-1833] refactored test item tests