Fix locking in qemudDomainCoreDump
Fix locking in qemudDomainCoreDump

The hang fix in d376b7d63ec1ef24ba4c812d58b9a414ddb561f8 was incomplete
since it left quite a few {Enter,Exit}Monitor calls which require driver
to be unlocked. Since the driver is locked throughout the whole
function, {Enter,Exit}MonitorWithDriver need to be used instead to
ensure driver is not locked when issuing monitor commands.

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