Zabbix

.......... [DEV-2375] added new Selenium tests for host and template group form

Merge in ZBX/zabbix from feature/DEV-2375-6.3 to master

* commit 'ad7df27b93db6f78dbe735f9a3df3133e5d6f0b7':
  .......... [DEV-2375] added show header field for widgets
  .......... [DEV-2375] reverted link locator
  .......... [DEV-2375] simplified code
  .......... [DEV-2375] added changes for link locator to find all links
  .......... [DEV-2375] removed code after ZBX fixes
  .......... [DEV-2424] fixed typo
  .......... [DEV-2375] added fixes after review
  .......... [DEV-2375] changed variables property to protected and added const
  .......... [DEV-2375] fixed form refresh after clone
  .......... [DEV-2375] changed files mode
  .......... [DEV-2375] fixed related Selenium tests
  .......... [DEV-2375] added host and template group form tests