bugfix: convert a few "echo"es to "printf"s

While UNIX standards (IEEE Std 1003.1) describes that "echo" command
interprets the backslash sequence unless "-n" is specified, some major
shells don't.
Convert them to "printf".

Reported-by: Guan Xin <guanx.bac@gmail.com>
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
bugfix: fix the description for create=tdp

See also
http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg04546.html

Reported-by: Peter Kork <pkoersk@gmail.com>
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>