Add disk usage tests for Windows using WMI.
Add disk usage tests for Windows using WMI.

mrjefftang/psutil,cloudbase/psutil,msarahan/psutil,qbit/psutil,cloudbase/psutil,tomprince/psutil,mrjefftang/psutil,landryb/psutil,Q-Leap-Networks/psutil,jorik041/psutil,tomprince/psutil,landryb/psutil,jorik041/psutil,jamesblunt/psutil,mindw/psutil,mindw/psutil,tomprince/psutil,msarahan/psutil,0-wiz-0/psutil,landryb/psutil,packages/psutil,jorik041/psutil,msarahan/psutil,mindw/psutil,qbit/psutil,jamesblunt/psutil,Q-Leap-Networks/psutil,landryb/psutil,mindw/psutil,mindw/psutil,0-wiz-0/psutil,giampaolo/psutil,packages/psutil,qbit/psutil,jamesblunt/psutil,mrjefftang/psutil,tomprince/psutil,landryb/psutil,tomprince/psutil,giampaolo/psutil,cloudbase/psutil,packages/psutil