When using mirroring on a collection of brokers that can scale, it is necessary to be able to update the configuration on the fly, in the simplest form by updating some property files.

To support this, we need artemis config reload to peek at the broker connections 

see: https://issues.apache.org/jira/browse/ARTEMIS-4255 - https://issues.apache.org/jira/browse/ARTEMIS-4568

we can make use of address federation in place of the mirror for grouping brokers.