Zabbix

.......PS. [ZBX-21724] fixed updating of lastaccess for proxies in availman

Merge in ZBX/zabbix from feature/ZBX-21724-6.3 to master

* commit '967e9b868d549ceaa362ab77a17d908fe6e49b5b':
  .......PS. [ZBX-21724] removed debug
  .......PS. [ZBX-21724] code style fix
  .......PS. [ZBX-21724] fixes
  .......PS. [ZBX-21724] removed last_conn_time from datasender
  .......PS. [ZBX-21724] debug
  .......... [ZBX-21724] removed stamp-h1
  .......PS. [ZBX-21724] uploaded changes for avail manager
  .......... [ZBX-21724] added changelog
  .......PS. [ZBX-21724] fixed updating of lastaccess for proxies in availman if active proxy is used