ACCUMULO-1563 committing Jonathan Hsieh's patch to prevent the test from writing to /

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1502584 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1567 ignore recently split tablets when complaining about overlapping assignments

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1502587 13f79535-47bb-0310-9956-ffa450edef68