The ListenerRegistration protobuff messages are used to serialize the
corresponding CDS messages but we don't actually send these messages
over the wire so they don't need serialization. So the protobuff
messages were removed. If we do need to serialize these messages in he
future we won't use protobuff.
Change-Id: I3818a965e0fd4e1876364022f2de09b1bac216d5
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>