Zabbix

.......... [DEV-3683] fixed Selenium tests, changed dashboard saving to canceling

Merge in ZBX/zabbix from feature/DEV-3683-6.5 to master

* commit 'b2f7e4171e08be3775636ec0ba602a24d6d230ee':
  .......... [DEV-3683] fixed dead code
  .......... [DEV-3683] removed extra wait
  .......... [DEV-3683] added cancel dashboard instead of saving