[btcsuite/btcd] 9350b9: mempool: Correct cmd field for rejected txns.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 9350b939bc03c3c88b4cb424eee752428aa74acb
      
https://github.com/btcsuite/btcd/commit/9350b939bc03c3c88b4cb424eee752428aa74acb
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-05-26 (Tue, 26 May 2015)

  Changed paths:
    M blockmanager.go

  Log Message:
  -----------
  mempool: Correct cmd field for rejected txns.

This commit corrects an issue where the reject message sent in response
to rejected transactions had the Cmd field set to "block" instead of
"tx".

Fixes #436.