[Hawkular-dev] bus API changes - BasicMessage will be interface - AbstractMessage is the new superclass

this is a heads up: Peter has done some refactoring work on the bus API - part of it means BasicMessage is now an interface and AbstractMessage is the new "superclass" that messages extend. IIRC, both inventory and alerts use the bus API as well. this means once this gets merged: https://github.com/hawkular/hawkular-bus/pull/44/files We'll probably need to fix inventory and alerts as well.