block: teach bdrv_debug_breakpoint skip filters with backing
Teach bdrv_debug_breakpoint and bdrv_debug_remove_breakpoint skip filters with backing. This is needed to implement and use in backup job it's own backup_top filter driver (like mirror already has one), and without this improvement, breakpoint removal will fail at least in 55 iotest. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Message-id: 20190920142056.12778-9-vsementsov@virtuozzo.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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