Tests for Andrew's talloc security work

[Adrian Cochrane]

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.

Thanks again,
Adrian Cochrane

On Fri, Sep 4, 2015 at 4:03 PM, Adrian Cochrane 
<adrianc at catalyst.net.nz> wrote:
> These are patches Andrew Bartlett worked on to improve security 
> around talloc destructors and some tests I've added to ensure it 
> functions properly. Any feedback is greatly appreciated.
> 
> Thanks,
> Adrian Cochrane
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