Zabbix

........S. [ZBX-21159] improved HA startup error logging

Merge in ZBX/zabbix from feature/ZBX-21159-6.0 to release/6.0

* commit 'bf50301aa6926c3d47003ee077d58413a7818d74':
  ........S. [ZBX-21159] fix return error if HA manager stopped during startup
  .D........ [ZBX-21159] added changelog entry
  ........S. [ZBX-21159] improved logging in the case of permission errors during HA startup