[conformal/btcd] 9a853f: Use single cert/key for RPC by default.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 9a853fdf9001577610d0a1a2e2e2919769fb359a
      
https://github.com/conformal/btcd/commit/9a853fdf9001577610d0a1a2e2e2919769fb359a
  Author: Dave Collins <da...@conformal.com>
  Date:   2013-11-19 (Tue, 19 Nov 2013)

  Changed paths:
    M config.go

  Log Message:
  -----------
  Use single cert/key for RPC by default.

Also, while here, set the default RPC cert/key in the initial config
struct so the default will show when displaying the usage.