Change params for windows vm boot

fixes bug 1102516

As noted in the bug report, the existing command didn't work
as it was booting off the wrong drive and the syntax was wrong
for the drive parameter.

Cherry-picked from https://review.openstack.org/20180

Change-Id: Ie76fd2f5e951271db2bc9550c520a55a209da788
Merge "Change params for windows vm boot" into stable/folsom