Zabbix

...G...... [ZBX-26500] fixed system.users.num metric incorrect returned value for both agents

* commit 'd6fa42a263dab7a4bb79e0fc646faecf51362780':
  ...G...... [ZBX-26500] added ChangeLog
  ...G...... [ZBX-26500] changed PCI_TOTAL_SESSIONS to PCI_ACTIVE_SESSIONS to monitor active user sessions
  ...G...... [ZBX-26500] changed CounterTotalSessions to CounterActiveSessions in counting user numbers