Merge changes Id4971e54,Id80da21c,Ice446ec4,If10f00de,I4f59ad60

* changes:
  libbinder: doc RpcServer::join/shutdown behavior
  libbinder: RpcSession check no shutdown trigger
  libbinder: RpcState stop narrowing errors
  binderRpcTest: use waitpid
  libbinder: transaction includes refcount to binder