The idea behind the '-c' flag is to cleanup everything from a
previous test run which might cause the test script to fail.
This should also include removing the previously loaded module.
This makes it a little easier to run 'zconfig.sh -c', however
remember this is a test script and it will take all of your
other zpools offline for the purposes of the test. This notion
has also been extended to the default 'make check' behavior.
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