ACCUMULO-645: found more references to HADOOP_HOME

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1431596 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-279: add missing readmes

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1431597 13f79535-47bb-0310-9956-ffa450edef68