Change thinpooldev tests to panic to fail
Change thinpooldev tests to panic to fail

Instead of using TestResult to signal a test failed, panic via failed
unwrap(). This seems to be the way that test code typically indicates
failure.

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

mulkieran/stratisd,trgill/stratisd,stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd,trgill/stratisd,mulkieran/stratisd