Adding RFC822Name to certauth

[luneo7]

Add the possibility to use RFC822Name to do client certificate authentication, now there is two more parameters, and you can configure like that on nginx:

location = /certauth {
    zm_sso certauth_rfc822name;
    zm_sso_redirect_url 443;
}

location = /certauth/admin {
    zm_sso certauth_admin_rfc822name;
    zm_sso_redirect_url 9071;
}

[CLAassistant]

All committers have signed the CLA.

[luneo7]

Bugzilla #108279

[luneo7]

There is also the possibility to make automatic use of rfc822name if in the dn there is not a emailAddress, and thus not crating a new parameter and making it not necessary to change any existing configuration of the nginx proxy to use rfc822name.