Zabbix

........S. [ZBXNEXT-3290] fixed proxy configuration sync with postgres, fixed compiler warnings

Merge in ZBX/zabbix from feature/ZBXNEXT-3290-6.3 to master

* commit '1c8c19a51e0d73060facff7cdab4ec98607862d7':
  ........S. [ZBXNEXT-3290] style fix
  ........S. [ZBXNEXT-3290] fixed host indexing on proxies when working with postgresql
  .......PS. [ZBXNEXT-3290] fixed warning
  .......PS. [ZBXNEXT-3290] fixed clang warnings
  .......PS. [ZBXNEXT-3290] fixed issues reported by coverity