If you're installing ptest packages into an image there's a good chance
you want to run the tests. Assist with this by recommending
ptest-runner in the -ptest packages.
(From OE-Core rev: a9eededcb33b2ee41a061298610126436dfc2c11)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>