[conformal/btcd] dcf299: Add some missed imports in last commit.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: dcf2994905e3067d9c81b6dd21ae499d75cf7390
      
https://github.com/conformal/btcd/commit/dcf2994905e3067d9c81b6dd21ae499d75cf7390
  Author: Dave Collins <da...@conformal.com>
  Date:   2013-11-11 (Mon, 11 Nov 2013)

  Changed paths:
    M util/findcheckpoint/config.go
    M util/showblock/showblock.go

  Log Message:
  -----------
  Add some missed imports in last commit.