Zabbix

A.F....... [ZBX-18817] fixed missing API and import validation for "unsupported check" preprocessing step

* commit '718f342f353831fd265995c508f1b8de97ba6069':
  A......... [ZBX-18817] fixed coding style
  ..F....... [ZBX-18817] fixed incorrect default imported/exported value for preprocessing step error handler in 5.4
  ..F....... [ZBX-18817] fixed default values exported for preprocessing step "Check not supported"
  .D........ [ZBX-18817] added change log entry
  ..F....... [ZBX-18817] added "unsupported check" validation in XML import
  A.F....... [ZBX-18817] added unsupported preproc step validation for API
  ..F....... [ZBX-18817] fixed incorrect default value imported for preprocessing step error handler