Merge listening ports with possible other ones defined
by other barclamps (e.g. ceph).
make sure the are no duplicates
Merge pull request #176 from jsuchome/save_listen_ports

Merge listening ports with possible other ones defined
Sort the apache ports we're listening to

Otherwise, we restart apache every now and then.
Merge pull request #178 from vuntz/master

Sort the apache ports we're listening to