when use the clusteredNetconfTopology, the keepalive functions doesn't work fun.

when the keepalive-delay > 0 ,then log error:
can't cast keepaliveSalFacade to TopologyMountPointFacade
I resolve the problem with sseparating salFacade and keepaliveFacade variable, and put the salFacade to the NetconfConnectorDTO variable.
Lately I push my change to gerrit , we could see if it is appropriate.