Copy .bash versions of setchplenv for .zsh versions.

Add util/setchplenv.zsh and util/quickstart/setchplenv.zsh for zsh users. They are just copies
of the bash versions.

I verified both scripts work inside a zsh session.

http://zsh.sourceforge.net/

Also clean up output of .sh versions using printf to get non-breaking output (since
`echo -n` does not work).