SSL: RFC2253 compliant $ssl_client_s_dn and $ssl_client_i_dn.

SSL: RFC2253 compliant $ssl_client_s_dn and $ssl_client_i_dn.

Originally, the variables kept a result of X509_NAME_oneline(),
which is, according to the official documentation, a legacy
function.  It produces a non standard output form and has
various quirks and inconsistencies.

The RFC2253 compliant behavior is introduced for these variables.
The original variables are available through $ssl_client_s_dn_legacy
and $ssl_client_i_dn_legacy.