CMSSW_7_0_0_XROOTD2

Changes since CMSSW_7_0_0_XROOTD:

  1. 3491 from @bbockelm: xrootd – Multisource xrootd v4 created: 2014-04-25 02:37:21 merged: 2014-04-25 05:54:37