Zabbix

...G...PS. [ZBX-9867] improved Zabbix daemon termination by not using signal unsafe functions in signal handler; improved Zabbix server and Zabbix proxy process termination by stopping data collection and waiting for history syncers to finish

* commit '32c9cd8091f0685282399fea81e095de857f3f89':
  .......... [ZBX-9867] added ChangeLog entry
  .......... [ZBX-9867] added ChangeLog entry
  .......... [ZBX-9867] removed extra new line
  .......... [ZBX-9867] removed test code
  .......... [ZBX-9867] fixed missing prototype warning and error message
  .......PS. [ZBX-9867] added termination of lld manager and lld worker
  .......PS. [ZBX-9867] added termination of lld manager and lld worker
  .......... [ZBX-9867] merge branch 'feature/ZBX-9867-4.0' into feature/ZBX-9867-4.2
  .......... [ZBXNEXT-826] updated release date and version [4.2.4]