[conformal/btcd] 9f1382: Use defaults in config struct for btcctl.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 9f1382f03c1df0732384dbbc006a112b07787f65
      
https://github.com/conformal/btcd/commit/9f1382f03c1df0732384dbbc006a112b07787f65
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-03-19 (Wed, 19 Mar 2014)

  Changed paths:
    M util/btcctl/config.go

  Log Message:
  -----------
  Use defaults in config struct for btcctl.

Rather than doing a lot of if/else in the configuration load for btcctl,
set the default for the RPC server to localhost and the RPC cert to the
btcd cert, then override them as needed depending on the --wallet and
--testnet flags.