aufs: tiny, replace seq_printf() by seq_puts()

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
aufs: tiny, minor optimization in au_wr_dir_cpup()

Since copy-up is more popular than copy-down, I suppose.

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
aufs: tiny, convert struct au_cpdown_dir_args into a scalar

By removing an unnecessary field.

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
Merge remote-tracking branch 'aufs3-standalone/aufs3.2/00base' into aufs3.2/10static
Merge branch 'aufs3.2/10static' into aufs3.2/11proc_map
Merge branch 'aufs3.2/11proc_map' into aufs3.2/18public