rebase of pull 44

thought i would rebase pull https://github.com/xaque208/puppet-unbound/pull/44. i had to remove to following
  * max_udp_size - not available in the version installed on ubuntu 12.04
  * rrset_roundrobin - not available in the version installed on ubuntu 12.04
  * local_d - couldn't get it to work if there are no includes, even tried an empty file but no success 

 I also reverted the white space changes as 2 whitespace is much more inline wit puppet style and it seems to be more inline with your style (and mine for that matter). have only tested on a basic install of ubuntu 12.04.  
I'm in favor of managing anything to do with the firewall elsewhere.  I for one don't run unbound on Linux, so this is completely unhelpful to me.  This also doesn't take into account any ACLs configured in unbound or the listening interface, or the listening port number, all of which are more about the deployment of unbound, and not really about unbound itself.  This kind of logic can be wrapped in a profile class of some kind that is tailored to the deployment of the unbound server.  If its not too much to ask, could we please keep all firewalling out of this module?