Zabbix

.......... [DEV-4695] extended maintenance form Selenium autotest scenarios

Merge in ZBX/zabbix from feature/DEV-4695-7.0 to release/7.0

* commit '0c39ce64506a3d3f8f55a5ef4a53cd2d3eb5e7e2':
  .......... [DEV-4695] fixed spelling
  .......... [DEV-4695] added missing cases and fixed minor coding style issues in Selenium test
  .......... [DEV-4695] fixed spelling mistake
  .......... [DEV-4695] made the changes required in code review
  .......... [DEV-4695] made changes accordingly to problems found in syntax check build
  .......... [DEV-4695] added additional scenario in period form validation method
  .......... [DEV-4695] changed a variable from form to dialog type in screenshot assertion
  .......... [DEV-4695] renamed period form method back to its previous name to check screenshot failure reason
  .......... [DEV-4695] moved period form screenshot assertion into the period type cycle
  .......... [DEV-4695] added period form checks, added more scenarios in existing methods
  .......... [DEV-4695] completed create and update scenarios
  .......... [DEV-4695] continued period layout test, began create methods new version
  .......... [DEV-4695] upgraded layout and cancel scenarios