Zabbix

.......... [DEV-4147] made thread struct args initialization explicit

Merge in ZBX/zabbix from feature/DEV-4147-7.3-3 to master

* commit '5f38dffb20b35dfd2610178379c9616c3880ccf6':
  .......... [DEV-4147] made proxy ipmimanager_args consistent with server ipmi_manager_args
  .......... [DEV-4147] reverted agent change
  .......... [DEV-4147] added agent
  .......... [DEV-4147] made thread struct args initialization explicit