Add support for 'Protocol' to mod_ssl.

Example Config:

Listen 10.0.0.10:443 https

<VirtualHost 10.0.0.10:443>
SLCertificateFile conf/server.cert
SSLCertificateKeyFile conf/server.key
ServerName foo:443
DocumentRoot /var/www/foo
....
</VirtualHost>

Notice, no need for 'SSLEngine on'.  You can also set 'Protocol https' inside the virtual host, 
if you do not set it in the Listen command.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/listen-protocol@168462 13f79535-47bb-0310-9956-ffa450edef68