renameat2 syscall: turn EEXIST into ENOTEMPTY

renameat2 syscall: turn EEXIST into ENOTEMPTY

XFS is returning EEXIST rather than ENOTEMPTY for several of
these rename tests. The rename man page says this about the errors:

       ENOTEMPTY or EEXIST
              newpath is a nonempty directory, that is, contains
              entries other than "." and "..".

Which implies that both errors are valid and so the test should pass
in either case.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>