MAHOUT-992: qualify the path to make sure we get it from the local file system properly

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1491293 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-992: more cleanup on DistCache usage

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1491294 13f79535-47bb-0310-9956-ffa450edef68