ACCUMULO-1062 2000 threads is a little too much for a unit test

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1446290 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-919 use the trash to cleanup root tablet files, recovery files, and WAL

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1446314 13f79535-47bb-0310-9956-ffa450edef68