Provide an option to override apache listen IP/Port

[camlafit]

Hello

In some case we want set a proxy or any service ahead of Apache as nginx/haproxy/varnish.

In this case we need to manage two information

• Listen port
• Listen IP

All vhost should be set in ssl module test to provide an optional TLS/SSL listen, as this any frontend could be manage this part if adismod ssl is done

Two new variables could be provided to specify port and ip listen, if unset should be :

• IP = *
• port = 80