oeqa/selftest/multiprocesslauch: Fix test race
Having two possible failures in multiprocesslauch creates a race where one failure
may occur and stop processes being lanuched meaning the second failure may not
be seen. Rather than having periodic races appearing on the autobuilder, only
have one failure, making the test much more deterministic.
[YOCTO #13054]
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
31e9dcda40aae3ce0801580c838928956e1455e3)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
