Zabbix

........S. [ZBX-16445] fixed possible duplicate key insertion during LLD

* commit '86ada6d5c313f8eb8bf315506e757d459642049f':
  .D........ [ZBX-16445] add ChangeLog
  ........S. [ZBX-16445] allocate sql buffer only when item lld updates are pending
  ........S. [ZBX-16445] rename keys for updated keys only
  ........S. [ZBX-16445] rename updated keys to avoid duplications
  ........S. [ZBX-16445] revert last commit
  ........S. [ZBX-16445] LLD doesn't correctly update items when item prototype is fixed