selftest/prservice: Improve test failure message
When failing, give more information about why exactly a failure is
happening such as the PR values in question.
Signed-off-by: 
Richard Purdie <richard.purdie@linuxfoundation.org>
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When failing, give more information about why exactly a failure is
happening such as the PR values in question.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>