RHINENG-3742: Multiple kafka brokers

[psegedy]

• we need to use multiple kafka brokers - use KafkaServers for that
• we probably no longer need to overwrite KAFKA_ADDRESS, it doesn't seem to be used anywhere
• handle Endpoint and PrivateEndpoint separately, structs are no longer equivalent after latest changes in Clowder (Enfpoint has extra ApiPath field and we can't convert PrivateEndpoint to Endpoint 😞 )

Secure Coding Practices Checklist GitHub Link

• https://github.com/RedHatInsights/secure-coding-checklist

Secure Coding Checklist

• Input Validation
• Output Encoding
• Authentication and Password Management
• Session Management
• Access Control
• Cryptographic Practices
• Error Handling and Logging
• Data Protection
• Communication Security
• System Configuration
• Database Security
• File Management
• Memory Management
• General Coding Practices

[jira-linking]

Referenced Jiras:
https://issues.redhat.com/browse/RHINENG-3742