Zabbix

...G...PS. [ZBX-26080] fixed old file descriptors being hold when external log rotation is used

Merge in ZBX/zabbix from feature/ZBX-26080-6.0 to release/6.0

* commit '430c0385128ecee935c29af7b68de8f997631ecd':
  .......... [ZBX-26080] added changelog
  ...G...... [ZBX-26080] fixed order
  ...G...... [ZBX-26080] removed unused code
  ...G...... [ZBX-26080] fixed main loop of agent
  ...G...... [ZBX-26080] fixed ha manager and history syncer to redirect stdout and stderr
  ...G...... [ZBX-26080] reverted agent main loop change
  ...G...... [ZBX-26080] style fix
  ...G...... [ZBX-26080] small fix
  ...G...PS. [ZBX-26080] fixed holding of old fds after log was externally rotated