ACCUMULO-2433 Use IteratorSetting instead of config to avoid ZK issues. Fix loop variable usage.
ACCUMULO-2433 Ensure that we wait for teh constraint update to propagate to the tserver

This test has the potential to fail because of how `createtable -evc` is implemented.
It sets a zk property which the tserver hosting the tablet for the given table must
notice that the property changed so that it enforces the constraint.