Tests for Andrew's talloc security work

[Jeremy Allison]

On Fri, Sep 11, 2015 at 02:52:46PM +1200, Adrian Cochrane wrote:
> This update to my patches fixes a problem with the test asserting
> that two different processes use different talloc magic which
> prevented it from running. Apologies for not alerting you to the
> problem earlier.
> 
> I further want to point out that there's already a test asserting
> Talloc works across threads and of-course these patches pass it.
> While this is a simple test it does indicate these updates are
> thread safe.

Yes, but now run that test under valgrind with the threading
test tools. *That's* the real test.