Zabbix

A......... [ZBX-21871] directed updates in usergroup.users to happen via user.usrgrps

* commit '33561343452cd71fb427ac1b37d659d9edd31d63':
  A......... [ZBX-21871] simplified code; reverted function scope changes
  A......... [ZBX-21871] transferred changes from 6.0 branch; improved code style for provisioned user object audit logging