Fix DNP3MasterPort state listener when being called on a disabled stack (multidrop scenario)
Fix DNP3MasterPort state listener when being called on a disabled stack (multidrop scenario)

neilstephens/opendatacon,neilstephens/opendatacon,neilstephens/opendatacon,neilstephens/opendatacon,neilstephens/opendatacon,neilstephens/opendatacon,neilstephens/opendatacon