Merge branch 'CA-178380' into 'master'

 CA-178380:Reset-on-boot VDI does not release space after reboot

Hi,

Rebooting the VM release the leaf of the VDI and thus we see less SR physical utilization.(before the reboot sr physical utilization was around 3GiB and turned out to 2 GiB after the reboot)  The feature is working correct - but what we verified in the test case is not right IMO ...
We are doing "sr physical utilization after write into vdi > = sr physical utilization after we reboot the VM = BUG" instead we should "sr physical utilization after we reboot the VM >= sr physical utilization after write into vdi =  BUG )

Thanks,
-Rama.

See merge request !22