Fixes Hyper-V volume mapping issue on reboot

Hyper-V does not manage iSCSI mounted passthrough disks
correctly on reboot in some circumstances where disk
number assignment can change, resulting in instances potentially
booting with the wrong volume attached.

Co-Authored-By: Adelina Tuvenie <atuvenie@cloudbasesolutions.com>
Co-Authored-By: Adrian Bora <abora@cloudbasesolutions.com>

Change-Id: I99fa75aaa950de2ada8a03bd23c910c3ff810d69
Closes-Bug: #1322926
Merge "Fixes Hyper-V volume mapping issue on reboot"