Remove unused findZabbixItem() method.
Remove unused findZabbixItem() method.

alexanderzobnin/grafana-zabbix,xiaohuiz/grafana-zabbix,xiaohuiz/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix