Currently the AMQ drainer ignore the value of the env AMQ_MESH_DISCOVERY_TYPE even if it's set to dns or kube.
This is hardcoded to kube by default here: https://github.com/jboss-openshift/ce-amq/blob/master/drain/src/main/java/org/jboss/ce/amq/drain/BrokerServiceDrainer.java#L54
Does mean that we should add the extra permission even if we choose dns.