I added notes indicating that the best practice for automated testing
is to inherit these classes by using the IMAGE_CLASSES variable instead
of the INHERIT variable.
(From yocto-docs rev: 70e18e93e96f283ae183f5f4468859bfca37c581)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>