Zabbix

.......PS. [ZBXNEXT-9497] added icmppingretry item key

Merge in ZBX/zabbix from feature/ZBXNEXT-9497-7.3-new to master

* commit '71507948fb8646124cc708ada20284c4243c6cac':
  .......PS. [ZBXNEXT-9497] fixed pinger item hashset comparison
  .......PS. [ZBXNEXT-9497] fixed backoff parameter parsing
  .......... [ZBXNEXT-9497] fixed warnings in tests
  .......... [ZBXNEXT-9497] fixed warnings in tests
  .D........ [ZBXNEXT-9497] added changelog entry
  .......PS. [ZBXNEXT-9497] improved fping argument construction, added debug logs
  .......PS. [ZBXNEXT-9497] updated cmocka tests
  .......PS. [ZBXNEXT-9497] fixed hash calculation for pinger items
  .......PS. [ZBXNEXT-9497] fixed backoff validation and output processing
  .......PS. [ZBXNEXT-9497] added icmppingretry invocation