
  In ReadBuffer, do not set the username is already set.
  Fixes a problem when retrieving files from workers where the username is different,
  e.g. PoD on gLite.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@43440 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT