bitmaps: repair images with 'extra_data'
In some cases, extra data might be perfectly valid. In others, this might be a sign of corruption.
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Can "qemu-img check" be made to be more tolerant? bitmap_list_load would have to parse and store the extra_data, but only on READ_ONLY modes where it might be safe to do so.
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If we do find corruption via qemu-img check, we might want to augment repair to help us scrub the corrupted bitmap tables.