test_sanity: use ARRAY_LENGTH everywhere to make it easier to update context/stream counts in sub-tests.
test_sanity: use ARRAY_LENGTH everywhere to make it easier to update context/stream counts in sub-tests.

ieei/cubeb,padenot/cubeb,padenot/cubeb,kinetiknz/cubeb,padenot/cubeb,kinetiknz/cubeb,ieei/cubeb,kinetiknz/cubeb