Zabbix

.......... [DEV-3016] added new test cases for item value widget with aggregation function

* commit '1e26e2554af1f6b72795a98ec53a9d2ebae4315e':
  .......... [DEV-3016] added fixes regarding code review
  .......... [DEV-3016] fixed expected amount of hosts
  .......... [DEV-3016] added test cases for trends check
  .......... [DEV-3016] fixed code style
  .......... [DEV-3016] fixed testDashboardItemValueWidget_AggregationFunctionData unstable tests
  .......... [DEV-3016] fixed testDashboardItemValueWidget_ThresholdColor unstable tests
  .......... [DEV-3016] added test cases for aggregation function data check
  .......... [DEV-3016] removed unused variable
  .......... [DEV-3016] added test cases for threshold checks