block: Document that x-blockdev-change breaks quorum children list
Removing a quorum child node with x-blockdev-change results in a quorum driver state that cannot be recreated with create options because it would require a list with gaps. This causes trouble in at least .bdrv_refresh_filename(). Document this problem so that we won't accidentally mark the command stable without having addressed it. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com>
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