[btcsuite/btcd] ff4ada: Add automatic RPC configuration.

[Hector Jusforgues]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: ff4ada0b0e1ebffa3f9c15cadc96ab0d08a11034
      
https://github.com/btcsuite/btcd/commit/ff4ada0b0e1ebffa3f9c15cadc96ab0d08a11034
  Author: Hector Jusforgues <hector.jusforg...@gmail.com>
  Date:   2016-06-03 (Fri, 03 Jun 2016)

  Changed paths:
    M cmd/btcctl/config.go
    M config.go
    A config_test.go

  Log Message:
  -----------
  Add automatic RPC configuration.