https://issues.apache.org/jira/browse/AMQ-5378 - shell script improvements
https://issues.apache.org/jira/browse/AMQ-5391: use null or empty address to signify
 anonymous-relay node, in line with expected direction for the Addressing spec
 underway at OASIS AMQP TC
https://issues.apache.org/jira/browse/AMQ-5391: offer the ANONYMOUS-RELAY connection capability to
 signal support for the anonymous relay