Zabbix

........S. [ZBX-19658] added query batching when reading event data during maintenance processing

Merge in ZBX/zabbix from feature/ZBX-19658-5.0 to release/5.0

* commit '3ac6399ff6e0a1b24a50fc1998dee2287cb31517':
  ........S. [ZBX-19658] fixed warning
  ........S. [ZBX-19658] small style fix
  .D........ [ZBX-19658] added changelog entry
  ........S. [ZBX-19658] don't read tags when supppressing events if no maintenance uses them
  ........S. [ZBX-19658] added query batching when reading event data during maintenance processing