when working to implement kafka streams interactive queries, i see that i can set `application.server` with `host:port`
i would like a more generic mechanism to set additional properties.
i'm using cloud foundry containers for my kafka streams app. i scale out my containers using `cf scale`. each gets its own instance id. the instance id can be used in an http header to get cloud foundry to route the http to the correct instance
i realize, per Matthias J Sax, that Kafka Streams only distributes the information but does not use it. Thus, i can put the instance-id as the port.
Changing the config or add a new one is a public API change are requires a KIP: https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Improvement+Proposals