Ensure we show the failing exit code in case of failures.
We're seeing autobuilder failures with -15 (SIGTERM) which is probably from
slow boot/init. Retry in these cases for now.
(From OE-Core rev: 1bd6b0e29650c34652c1027b6975eb8620a73c55)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 127d3bd8d5509ae17e359c1365859fd362ffc74f)
Signed-off-by: Steve Sakoman <steve@sakoman.com>