Fix irregularities in GENERAL_NAME_print().

Add colon when printing Registered ID.
Remove extra space when printing DirName.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1401)