ntdll/tests: Add tests for accessing \\Device\\Null.

[Sebastian Lackner]

On Windows the async functions always return immediately, but the tests are
written in such a way that they are also compatible with a delay (which will
be the case if we implement it as a device driver).

---
 dlls/ntdll/tests/om.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
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