This should speed the test up signficiantly without any loss of functionality
for the purposes of the test.
(From OE-Core rev: 3dde0b749643575878bfbca2f8d2d9ec30bad166)
(From OE-Core rev: 51989db2d9eebd9f190994109c2932dac3f3034b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>