Unmount ISO when switching CDROM backends for a VM #920
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If the guest OS mounts the virtual cdrom device then vsphere expects
someone to confirm that it should be "unlocked" first.
This is done via a VirtualMachineQuestionInfo object that we need to
find and then respond to via the "AnswerVM" method. We start a goroutine
right before we attempt any VM modifications and signal we're done right
after we're done. If a known question appears in the mean time, we will
send the appropriate answer.