Detect subscribers changes in KafkaChannel reconciler (#2304)
Detect subscribers changes in KafkaChannel reconciler (#2304)

When a subscriber is added or removed, the reconciler won't detect
this change and it won't update the contract generation, leading
to the data plane to skip the reconciliation since a contract
with the same generation is considered the same contract.

Signed-off-by: Pierangelo Di Pilato <bf2f29ea09b3cb50cb8a51bbebdb9b3cef9d9af1@redhat.com>
knative-sandbox/eventing-kafka-broker,knative-sandbox/eventing-kafka-broker,knative-sandbox/eventing-kafka-broker