alter topic --replication-factor infinite loop when ISR missing

[raphaelauv]

with a topic of 3 partitions and replica factor 2 and URP at 2 (because broker 3 is not available)

running

kafkactl alter topic topic-3 --replication-factor 1

never end ->

reassignment running for topic=topic-3 partition=2: replicas:[3 1] addingReplicas:[] removingReplicas:[1]
reassignment running for topic=topic-3 partition=2: replicas:[3 1] addingReplicas:[] removingReplicas:[1]
reassignment running for topic=topic-3 partition=2: replicas:[3 1] addingReplicas:[] removingReplicas:[1]
reassignment running for topic=topic-3 partition=2: replicas:[3 1] addingReplicas:[] removingReplicas:[1]
reassignment running for topic=topic-3 partition=2: replicas:[3 1] addingReplicas:[] removingReplicas:[1]
reassignment running for topic=topic-3 partition=2: replicas:[3 1] addingReplicas:[] removingReplicas:[1]
...

and situation on the topic is ->