DISPATCH-56: Implemented Create/Read/Update/Delete operations on $management2

The $management2 addresss now supports Query, Create, Read, Update and Delete operations.

Query, Create and Read are functional.

Update and Delete are stubbed to raise NO_IMPLEMENTATION, they can be
implemented case by case.

TODO: merge $management2 and $management agents into one.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/trunk@1610827 13f79535-47bb-0310-9956-ffa450edef68