Option to change default Apache listening port, for SSL too

Hi,

I needed to change default Apache listening port when using your Puppet module. I saw in this issue https://github.com/camptocamp/puppet-apache/issues/15 that this little improvement could interest you, so look at my code and if it's okay for you to merge on your code, please accept this humble contribution. If you want me to modify the way it's done, tell me.

Bye.