Fix BoringUtilsSpec to require no dedup

This adds two tests to the BoringUtilsSpec to explicitly verify that
deduplication is required when boring. This adds tests that both
verify that the test passes as expected with deduplication enabled and
that the same test fails with deduplication disabled.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>