Zabbix

...G...... [ZBX-17815] fixed connection timeout when persistent buffer enabled

* commit '33aaf442a74caada8bc70c7e8a314f69c084a6b1':
  ...G...... [ZBX-17815] remove empty line
  ...G...... [ZBX-17815] added the comment about the updateConnection()
  ...G...... [ZBX-17815] restored seemingly redundant 1) setDeadline() from tls.go recvTLS()
  ...G...... [ZBX-17815] removed redundant 1) setDeadline() from tls.go recvTLS() and 2) updateConnections() from resultCache.go
  ...G...... [ZBX-17815] fixed connection timeout when persistent buffer enabled

(cherry picked from commit 88cb33ba69cedfa67418598f2b1cde6b0f3e625b)