Zabbix

.......... [DEV-2159] stabilized Back-end Integration Jenkins tests

Merge in ZBX/zabbix from feature/DEV-2159-6.0 to release/6.0

* commit 'aae5d830adf1ea6005e2fd6e3246d2cbd26e6f0e':
  .......... [DEV-2159] fixed PR warnings
  .......... [DEV-2159] fixed testEscalations
  .......... [DEV-2159] fixed spaces
  .......... [DEV-2159] fixed testGoAgentDataCollection
  .......... [DEV-2159] fixed threshold and average calculation
  .......... [DEV-2159] debug commit
  .......... [DEV-2159] fixed average item calculation
  .......... [DEV-2159] fixed unstable test cases
  .......... [DEV-2159] fixed non-ASCII symbol
  .......... [DEV-2159] fixed graph linking2
  .......... [DEV-2159] fixed graph linking
  .......... [DEV-2159] fixed pid check
  .......... [DEV-2159] reverted removed pid functionality for stopped component
  .......... [DEV-2159] added cache reload
  .......... [DEV-2159] added server component
  .......... [DEV-2159] removed pid functionality for stopped component

(cherry picked from commit 078e422c6657bc832cb7f676197e4a30b7c06cd1)