Zabbix

.......... [DEV-4771] added additional checks for saved username, password and allowed hosts values

* commit '15a4c93f0e24bbfa24214e5cd260e48eeac6b0a3':
  .......... [DEV-4771] changed legacy code to the new framework, changed field search from element IDs to labels
  .......... [DEV-4771] added allowed hosts, username and password checks for item prototype, simplified test scenarios
  .......... [DEV-4771] added password,username and allowed hosts checks