The WMI api used to enumerate volumes on 2016 is not available during the
specialize step.
The WMI namespace in cause is '//./Root/Microsoft/Windows/Storage'
We need to fallback on win2k16 to the previous used storage management (VDS).
Change-Id: Ib082443c34dcba64697f165c9b2902f3f61c7e39
Closes-bug: #1661725