Add exteranlIPS and loadBalancerIP values to zabbix agent

[Elbandi]

What this PR does / why we need it:

Zabbix agent running in cluster, but server is outside. This patch allow agent service set the ip address, if service type is loadbalance.

Special notes for your reviewer:

Checklist

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• [ ] DCO signed
• [ ] Chart Version bumped
• [ ] Variables are documented in the README.md