[conformal/btcd] 08fc30: Convert to use new btcutil.Tx and btcchain APIs.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 08fc3050a3baeab5d984f149aecbae7683bed8ba
      
https://github.com/conformal/btcd/commit/08fc3050a3baeab5d984f149aecbae7683bed8ba
  Author: Dave Collins <da...@conformal.com>
  Date:   2013-10-28 (Mon, 28 Oct 2013)

  Changed paths:
    M blockmanager.go
    M mempool.go
    M peer.go
    M rpcserver.go

  Log Message:
  -----------
  Convert to use new btcutil.Tx and btcchain APIs.

This commit updates btcd to work with the new btcchain APIs which now
accept btcutil.Tx instead of raw btcwire.MsgTx.  It also modifies the
transaction memory pool to store btcutil.Tx.

This is part of the ongoing transaction hash optimization effort noted in
conformal/btcd#25.