From Gerri: - Fix for xrootd version detection for untagged builds. - Detect a slight addition in the XrdClient API needed to reuse open   connections in PROOF.
From Gerri:
- Fix for xrootd version detection for untagged builds.
- Detect a slight addition in the XrdClient API needed to reuse open
  connections in PROOF.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@38488 27541ba8-7e3a-0410-8455-c3a389f83636

bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical