assertTrue prints "False is not True" if it fails, which is pretty much
useless. Use a more appropriate assertion test where practical and add a
message where it isn't.
(From OE-Core rev: 0e0dd2575bb2a1b6f6c5eba1f8cfb0d81cc1b091)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>