Extend SSL_CONF to return command value types.
Add certificate and key options.
Update documentation.
(cherry picked from commit ec2f7e568ea18a22ab57326fffe78ef2aa6884f5)
Fix some typos and update version number first added: it has now been
backported to OpenSSL 1.0.2.
(cherry picked from commit 4365e4aad97fa37e4a97eb2270a64c03e6547014)