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Implemented _CheckNodesFreeDiskPerVG and _ComputeDiskSizePerVG functions
for VG-aware iterations.
Signed-off-by: Dmitry Chernyak <dmi.chernyak@gmail.com>
[iustin@google.com: some style fixes (long lines, etc.)]
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>