[conformal/btcd] 50484c: Update sample config file with recent changes.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 50484c58416fd9a4e0c8785df5d353a39b7a158d
      
https://github.com/conformal/btcd/commit/50484c58416fd9a4e0c8785df5d353a39b7a158d
  Author: Dave Collins <da...@conformal.com>
  Date:   2013-11-13 (Wed, 13 Nov 2013)

  Changed paths:
    M sample-btcd.conf

  Log Message:
  -----------
  Update sample config file with recent changes.

This commit updates the sample config file to add the new listen option
and update the semantics regarding the combination of --proxy and --tor
flags.