RT3513: req doesn't display attributes using utf8string

CSR attributes are written (by 'req') in utf8string, but displaying printed output ('-text') won't show them and instead displays 'unable to print attribute'.


I believe this fixes RT3513, though it's not just limited to challengePassword.

http://rt.openssl.org/Ticket/Display.html?id=3513&user=guest&pass=guest