Neutron stage2

This is mostly:
- cleanup of old comments, reviewed firewall ports on controller
- fixed, added params and re-aligned seeds.rb accordingly
- replaced everywhere 'pacemaker' name with 'controller', because, it just make sense, especially when pacemaker won't be used (no HA)

Also,  
- moved neutron_net and neutron_subnet stuff (that was commented in neutron::networker) to its own subclass.  
This is for creating the public (external) network by default.  
This is not used by default, the subclass must be added on a controller.  
Anyway, it's not working because:
https://github.com/stackforge/puppet-neutron/blob/master/lib/puppet/type/neutron_subnet.rb#L29