Attempting NodeRpc (or streaming node rpc) for clients that do not
support it causes it to hang indefinitely because while the TCP
connection exists, the client will never respond.
This PR fixes an issue where if the client has multiple connections to a
server, a single connection closing would cause the routing to the node
to be lost.
This PR introduces an ack allowing the receiving end of the streaming
RPC to return any error that may have occured during the establishment
of the streaming RPC.
Alex Dadgar