Zabbix

.......PS. [ZBX-27496] improved network discovery subsystem to work with snmpv1 and snmpv2c checks

Merge in ZBX/zabbix from feature/ZBX-27496-7.0 to release/7.0

* commit '074972d70c00f0bdf3eecb8b8ee8017e944fb4e5':
  .......PS. [ZBX-27496] added changelog entity
  .......PS. [ZBX-27516] fixed type conversion, changed last ip related naming
  .......PS. [ZBX-27516] removed redundant counter
  .......PS. [ZBX-27516] fixed removing results of non existing drules
  .......PS. [ZBX-27516] reverted task manager limits for snmpv3
  .......PS. [ZBX-27516] removed libsnmp limits for task manager
  .......PS. [ZBX-27516] added multithread support to snmp_task_process to work with net-snmp lib
  .......PS. [ZBX-27516] reworked support of special processing for last ip of discovered range
  .......PS. [ZBX-27516] reverted all changes
  .......PS. [ZBX-27516] fixed snmp tasks manager
  .......PS. [ZBX-27516] fixed lastip detection and snmp task manager
  .......PS. [ZBX-27516] added support of special processing for last ip of discovered range
  .......PS. [ZBX-27516] improved worker capacity utilization for snmp network discovery

(cherry picked from commit 8ea50dab765158ab0ef975c9a6e15da325e409dd)