ACCUMULO-1196 applying Kevin Faro's patch to make du context-aware

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1459793 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1196 applying Kevin Faro's patch to make du context-aware

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1459795 13f79535-47bb-0310-9956-ffa450edef68