ACCUMULO-2082 Add in some better logging for the randomwalk Bulk tests.
ACCUMULO-2086 Use the tableID instead of the tableName where necessary.
ACCUMULO-2087 Check for the null result from zk and throw something slightly more meaningful.
ACCUMULO-2085 Also catch NamespaceNotEmptyException when deleting a namespace.
Merge remote-tracking branch 'origin/1.6.0-SNAPSHOT' into 1.6.0-SNAPSHOT