Zabbix

.......... [DEV-4894] fixed Selenium tests after implementation of inline validation to Administration settings forms

* commit '97f52c00cd0eefb7031ef8f55e3e4b8d022cfa64':
  .......... [DEV-4894] applied changes suggested in code review
  .......... [DEV-4894] applied changes suggested in code review for default statement
  .......... [DEV-4894] adjusted Selenium tests: testFormItem to use relative selector for Update button, testPermissionWithoutCSRF to validate absence of removed return_button
  .......... [DEV-4894] fixed Selenium tests thoise failed due to inline validation being introduced for testFormAdministration