Zabbix

.......... [DEV-2532] created Selenium test for testing data display in graphs and graph widgets

* commit '4dfc63514a56748939a26aa160c803ed7a280198':
  .......... [DEV-2532] implemented fixes according to review comments
  .......... [DEV-2532] updated master branch with the latest changes in 6.0 branch
  .......... [DEV-2532] implemented test for checking data display in graphs and graph related widget in master branch