ntdll/tests: add tests for NtQueryVolumeInformationFile with FileFsVolumeInformation class

[Louis Lenders]

> You should take that info from the volume (as it's done now in 
> GetVolumeInformation) instead of hard-coded invalid values.

I guess you're right, I wasn't aware of the fact that 
GetVolumeInformation already does such a job.
> I'm guessing some of that kernel32 functionality will need to 
> be moved to ntdll.

yes, i had a quick look at GetVolumeInformation , seems to me it'll be quite a
massive change. maybe someone more familiar with GetVolumeInformation code is
more suitable to do this job