1. Create AMQ Broker installation using cr_initial.yaml
2. update it into cr_step1.yaml
3. update it into cr_step2.yaml
4. Observe drainer pod which keeps crashing

Changes between crs:

1) initially, MessageMigration is turned on. Otherwise its a default CR of size 2.
2) Step1 is to disable MessageMigration.
3) Step2 is to scale the CR down to 1 instance of Broker.

Similar thing is happening to the opposite situation, i.e. :

1. No MM
2. Enable MM

In this case, Drainer pod starts and puts this in event log:

61s         Warning   FailedMount              pod/sd-broker-ss-1                                   Unable to attach or mount volumes: unmounted volumes=[sd-broker], unattached volumes=[sd-broker kube-api-access-pmjsr]: timed out waiting for the condition

What seems to be happening is, PVC is not removed after scaledown event, so that Drainer cant' attach it's PV.