selftest/reproducible: track unusued entries in the exclusion list

This helps with trimming down the list, and towards 100% reproducibility :)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit da7a173d)
Signed-off-by: Steve Sakoman <steve@sakoman.com>