quorum: Use bdrv_open_image()
Besides standardising on a single interface for opening child nodes, this simplifies the .bdrv_open() implementation of the quorum block driver by using block layer functionality for handling BlockdevRefs. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com>
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