block: Remove bdrv_swap()
bdrv_swap() is unused now. Remove it and all functions that have no other users than bdrv_swap(). In particular, this removes the .bdrv_rebind callbacks from block drivers. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
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