Fix 'vgreduce --removemissing' on stacked mirror

'vgreduce --removemissing' is similar to lvconvert but is different in:
- it removes any mirror images, not specifying the number
- all images may be removed from the mirrored LV
- mirrored LV itself may be removed

reconfigure_mirror_images() is the underlying function of vgreduce.

However, even with the recent patches of mine, reconfigure_mirror_images() doesn't work well for stacked mirror.

Attached patch fixes it.

Thanks,
--
Jun'ichi Nomura, NEC Corporation of America
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