The current failure mode doesn't show us what the logs actually looked like
and later cleans can lose them. Show the whole log in case of failure
to aid debugging intermittent problems on the autobuilder.
(From OE-Core rev: 7c3a0dc5978cea898b1ca51decf4d6e7cf9d519f)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>