[btcsuite/btcd] 1217e0: peer: Unexport the mru inventory map.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 1217e00d3977fc655d6db5fba3d2cffc3e65b5ab
      
https://github.com/btcsuite/btcd/commit/1217e00d3977fc655d6db5fba3d2cffc3e65b5ab
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-11-24 (Tue, 24 Nov 2015)

  Changed paths:
    M peer/mruinvmap.go
    M peer/mruinvmap_test.go
    M peer/peer.go

  Log Message:
  -----------
  peer: Unexport the mru inventory map.

This unexports the mruInventoryMap type since it is only needed within
the peer package.