kernel32/tests: Add tests for job objects

[Andrew Cook]

It's not that, ERROR_NOT_ENOUGH_QUOTA is returned from
AssignProcessToJobObject, but the process is randomly killed with
an exit code of 0 instead.

And the other process is killed with 0 otherwise
winetest_wait_child_process would complain, unless TerminateProcess
overwrites the exiting exit code.

On Mon, 2015-02-16 at 10:40 +0100, Hans Leidekker wrote:
> It looks like race condition. You create two processes and expect the
> second one to hit the limit but it seems to me that it could be the
> first as well.
> 
>