python/machine: Handle termination cases without QMP

If we request a shutdown of a VM without a QMP console, we'll just hang
waiting. Not ideal.

Add in code that attempts graceful termination in these cases.  Tested
lightly; it appears to work and I doubt we rely on this case anywhere,
but it's a corner you're allowed to wedge yourself in, so it should be
handled.

Signed-off-by: John Snow <jsnow@redhat.com>
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