Fix#24803 as this had been failing sometimes.
As the parallel tests are probably genuine failures, and
had already been cut down, I will re-create these specifically
as a parallel execution test with no seccomp to make the
cause clearer.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
(cherry picked from commit 84ec04306c)
Signed-off-by: Victor Vieux <vieux@docker.com>