[PATCH v8] kernelbase: Reimplement GetVolumeInformation on top of GetVolumeInformationByHandle.

[Erich E. Hoover]

This patch removes the volume querying information duplication in
kernelbase by re-implementing GetVolumeInformation using
GetVolumeInformationByHandle (itself implemented with
NtQueryVolumeInformationFile).  Many thanks to Zeb for additional
testing and suggestions.

v8: Fall back to SYNCHRONIZE (no GENERIC_READ) with slash on failure
v7: Fix Root_Slash to always use the correct drive letter and don't
use FILE_LIST_DIRECTORY
v6: No change
v5: Rebase against 1b1b6c5f7d28768feb853eefd015aa714b819ed4
v4: Reordered (no content change)
v3: No change
v2: Reordered (no content change)

Best,
Erich