Zabbix

.......... [DEV-2660] added new test for multiselects errors

Merge in ZBX/zabbix from feature/DEV-2660-6.5 to master

* commit '23c78f97b5088177cdabb5b25f9b84644244f72e':
  .......... [DEV-2660] removed executable flags
  .......... [DEV-2660] added phpdocs
  .......... [DEV-2660] added some style fixes and renaming
  .......... [DEV-2660] added more checks
  .......... [DEV-2660] renamed test
  .......... [DEV-2660] fixed comment
  .......... [DEV-2660] added problems page
  .......... [DEV-2660] added some refactoring
  .......... [DEV-2660] fixed after review vol.2
  .......... [DEV-2660] fixed after review vol.1
  .......... [DEV-2660] removed executable flags
  .......... [DEV-2660] fixed comments
  .......... [DEV-2660] extended test for hosts
  .......... [DEV-2660] refactored code to extend for hosts
  .......... [DEV-2660] added new test