Apache listen fix

So if you change the listen_port, the apache setups don't work. This is because apache isn't even listening on anything 

I thought about the possibility of something like:

`node['apache']['listen_ports'] << node['graphite']['listen_port']` in the apache recipe (which writes the apache ports.conf file)  but I'm not sure if that will work the way I would expect. 

Note that `node['apache']['listen_ports']` gets passed through a unique filter before being written but I think appending the listen port in the recipe would cause spurious conf file changes and thus spurious restarts of apache.