[conformal/btcd] 831066: Parse out ports from externalip strings if present...

[Owain G. Ainsworth]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 8310661c295c82363032ed49ff29a9bd43b577b3
      
https://github.com/conformal/btcd/commit/8310661c295c82363032ed49ff29a9bd43b577b3
  Author: Owain G. Ainsworth <o...@conformal.com>
  Date:   2013-12-16 (Mon, 16 Dec 2013)

  Changed paths:
    M server.go

  Log Message:
  -----------
  Parse out ports from externalip strings if present.

If not, continue to use the default. Should fix a problem reported by
Justus Ranvier on github.

Closes #38 (again)