Zabbix

.......... [DEV-4117] covered graphs aggregation functions with test

* commit '0470ce33b92dee3ef5704549f537499e7e681700':
  .......... [DEV-4117] added micro style fix
  .......... [DEV-4117] combined two dashboards into one
  .......... [DEV-4117] added comment
  .......... [DEV-4117] removed graph widget scenario, added cases to display data in graphs
  .......... [DEV-4117] added second item to data set
  .......... [DEV-4117] added aggregation cases to screenshot test
  .......... [DEV-4117] fixed code style, added comments
  .......... [DEV-4117] stabilized test
  .......... [DEV-4117] added test cases
  .......... [DEV-4117] added scenario

(cherry picked from commit 293b07e718682f95e8a67bdc0cc4c5299f8d1620)