Zabbix

.......... [DEV-2491] added new selenium test for cause and symptom events

Merge in ZBX/zabbix from feature/DEV-2491-7.1 to master

* commit '2e1baf156f165a316d33c9cb19debcec24caf32d':
  .......... [DEV-2491] added fixes regarding code review
  .......... [DEV-2491] fixed comment
  .......... [DEV-2491] fixed test scenario for ChangeProblemRanking flag check
  .......... [DEV-2491] fixed ChangeProblemRanking test scenario
  .......... [DEV-2491] added test scenario for ChangeProblemRanking flag check
  .......... [DEV-2491] added fixes regarding code review
  .......... [DEV-2491] added fixes regarding code review
  .......... [DEV-2491] updated comments; fixed code style issues
  .......... [DEV-2491] added test scenario for problems filtering
  .......... [DEV-2491] added test scenario for 'Convert to cause' state check
  .......... [DEV-2491] added new test cases for testCauseAndSymptomEvents_ContextMenu
  .......... [DEV-2491] added missing checks for testFormUpdateProblem_Layout test
  .......... [DEV-2491] updated prepareData; removed function
  .......... [DEV-2491] added context menu test scenario
  .......... [DEV-2491] added constants for xpath
  .......... [DEV-2491] added layout test scenario
  .......... [DEV-2491] updated comments
  .......... [DEV-2491] moved related test scenario to new test class
  .......... [DEV-2491] moved related test scenario to new test class