[conformal/btcwallet] 400153: Drain notification registeration channel.

[Josh Rickmar]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcwallet
  Commit: 400153d7c058dca1ed5a9e2f103c22eb07c6fa51
      
https://github.com/conformal/btcwallet/commit/400153d7c058dca1ed5a9e2f103c22eb07c6fa51
  Author: Josh Rickmar <jr...@conformal.com>
  Date:   2014-07-29 (Tue, 29 Jul 2014)

  Changed paths:
    M rpcserver.go

  Log Message:
  -----------
  Drain notification registeration channel.

This prevents a hang when attempting to set the wallet (and register
for wallet notifications) when the process is interrupted and the rpc
server begins shutting down.