[conformal/btcd] 1420ec: Use rpc errors defined in btcjson.

[John C. Vernaleo]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 1420eccf73d94c9ee95bda5989b70cafe18f28ac
      
https://github.com/conformal/btcd/commit/1420eccf73d94c9ee95bda5989b70cafe18f28ac
  Author: John C. Vernaleo <j...@conformal.com>
  Date:   2013-10-22 (Tue, 22 Oct 2013)

  Changed paths:
    M rpcserver.go

  Log Message:
  -----------
  Use rpc errors defined in btcjson.