[6/12] ntdll/tests: Add tests for threadpool timer merging.

[Sebastian Lackner]

On 03.07.2015 01:59, Sebastian Lackner wrote:
> ---
>  dlls/ntdll/tests/threadpool.c |  117 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 117 insertions(+)
> 

The test failure on Windows 7 seems to be random, it worked fine on a second run
(and also on several test runs before):

https://newtestbot.winehq.org/JobDetails.pl?Key=14968

If it occurs too often in practice we can increase the timeouts, but for now I think
it should be fine.

BTW: Forgot to mention, the Sleeps() in this patch are necessary because there is no way
to do any other kind of synchronization with the Windows internal timer queue thread.