[btcsuite/btcd] f3c442: server: Remove unused wakeup channel.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: f3c442deb2cfa5a918d51968596ed9992c5513b1
      
https://github.com/btcsuite/btcd/commit/f3c442deb2cfa5a918d51968596ed9992c5513b1
  Author: Dave Collins <da...@conformal.com>
  Date:   2016-10-27 (Thu, 27 Oct 2016)

  Changed paths:
    M server.go

  Log Message:
  -----------
  server: Remove unused wakeup channel.

This channel is no longer used since the outgoing connection logic is
handled by the connmgr package now.