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 'daffa1507aaaf703d1a0f356a8d6841890d23d57': (34 commits)
  .......... [ZBX-9867] addded ChangeLog entry
  .......PS. [ZBX-9867] fixed error reporting when shutdown is in progress
  .......PS. [ZBX-9867] fixed warning log
  .......PS. [ZBX-9867] removed extra space in log message
  .......PS. [ZBX-9867] reworked preprocessing progress reporting by history syncers
  .......PS. [ZBX-9867] style fix in sync_history_cache_full()
  .......PS. [ZBX-9867] improved error messages
  .......PS. [ZBX-9867] check for zabbix server shutdown when processing passive proxy data
  .......PS. [ZBX-9867] added missing function header
  .......PS. [ZBX-9867] fixed warning messages
  .......PS. [ZBX-9867] respond with error to active agent if history cannot be received
  .......PS. [ZBX-9867] respon with error to active proxy if data cannot be saved due to shutdown in progress
  .......PS. [ZBX-9867] style fixes
  .......PS. [ZBX-9867] improved history sync progress to go up to 100%
  .......PS. [ZBX-9867] only log progress once in 10 seconds
  .......PS. [ZBX-9867] only log progress if something is changed
  .......PS. [ZBX-9867] don't log that history is about to be synced in main process if already syncerd by syncers
  .......PS. [ZBX-9867] don't log that history is about to be synced in main process if already syncerd by syncers
  .......PS. [ZBX-9867] initial commit of history syncer progress during termination
  ...G...PS. [ZBX-9867] removed redundant include
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