Zabbix

.......... [DEV-4680] refactored browser warning page Selenium test

Merge in ZBX/zabbix from feature/DEV-4680-7.5 to master

* commit '0d3329a4bcd1636a6e3f846ac7acd361e024de9b':
  .......... [DEV-4680] minor fix
  .......... [DEV-4680] fix after review
  .......... [DEV-4680] fixed the code after review
  .......... [DEV-4680] testPageBrowserWarning format and assertScreenshot added
  .......... [DEV-4680] testPageBrowserWarning refactored