https://github.com/jboss-container-images/jboss-amq-7-broker-openshift-image/blob/amq-broker-72-dev/modules/amq-launch/added/drain.sh#L7

ENDPOINT_NAME="${AMQ_NAME}-amq-tcp"

This's pretty limiting configuration, because the user has to create the service with the appropriate suffix to have draining functioning correctly. Imho the variable should have default and should be allowed to be fully overwritten by defined env variable (e.g. AMQ_SERVICE_NAME).