[conformal/btcwire] c4135d: Move default network ports to btcnet package.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcwire
  Commit: c4135db7288579b2503007d1de88936e33d90033
      
https://github.com/conformal/btcwire/commit/c4135db7288579b2503007d1de88936e33d90033
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-05-29 (Thu, 29 May 2014)

  Changed paths:
    M protocol.go

  Log Message:
  -----------
  Move default network ports to btcnet package.

The default network ports are not really part of the wire protocol rather
they are part of a network parameters.  Thus, this commit moves them to
the btcnet package.