Bootstrap options on cache_client vs cache_server for the kafka binding

[vordimous]

Describe the bug

Shown below, the zilla schema does not care that the bootstrap options were used for both kinds of kafka bindings. This doesn't result in an error but a user can easily mistake these configs and assume the wrong behavior is being applied.

  kafka_cache_client:
    type: kafka
    kind: cache_client
    options:
      bootstrap:
        - items-crud
    exit: kafka_cache_server
  kafka_cache_server:
    type: kafka
    kind: cache_server
    options:
      bootstrap:
        - items-crud
    exit: kafka_client

Expected behavior
Show an error to the user if the bootstrap options are used with the wrong kind.

[jfallows]

Duplicates #808