ACCUMULO-745 fixed starting random walk

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1442678 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-259 fixed random walk test

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1442702 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-382 add random configuration changes during the chaos of the Concurrent test

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1442753 13f79535-47bb-0310-9956-ffa450edef68