* Honoring auto startup in Kafka Streams binder When using Kafka Streams bineder, the processors are started unconditionally, i.e. autoStartup is always true by default. If spring.kafka.streams.auto-startup is set, then honor that as the auto-startup flag in the binder. Resolves https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/issues/1126 * Addressing PR review comments Auto startup flag is honored per individual consumer bindings as well. * Addressing PR review comments * Making KafkaStreamsRegistry#kafkaStreams set to use a concurrent Set.