[identation]

Signed-off-by: Alessandro Siniscalchi <asiniscalchi@gmail.com>
[Test_Comparator_audio] inherits from Test_Comparator
[Test_Comparator] is not a test anymore
[ideantation]
[Test_Comparator] is now in common for all Comparators tests
[orden]

Signed-off-by: Alessandro Siniscalchi <asiniscalchi@gmail.com>