ACCUMULO-1908 Make an odd du assertion a little more odd.
ACCUMULO-1908 Manually set filter on table and force deletetable.

It appears that testPertableClasspath could never pass as expected, but I didn't investigate how it did sometimes.
Because FooFilter extends Filter, it should always hang waiting for the option to be input. Additionally, the
deletetable should have also hung indefinitely because it wouldn't get the necessary user delete confirmation.