Zabbix

.........T [ZBXNEXT-5809] added VictorOps media

Merge in ZBX/zabbix from feature/ZBXNEXT-5809-5.2 to release/5.2

* commit '30bc8f8a471ab5a8277a3b6eda4c66b03a821a5e':
  .........T [ZBXNEXT-5809] changed message templates after QA
  .........T [ZBXNEXT-5809] fixed readme after QA
  .........T [ZBXNEXT-5809] fixed after QA
  .........T [ZBXNEXT-5809] fixed after review
  .........T [ZBXNEXT-5809] fixed typo
  .........T [ZBXNEXT-5809] added readme
  .........T [ZBXNEXT-5809] added VictorOps media