This commit adds logic for allocating and associating a public IP, if the `—load-balancer-ip` option is not used. It will do proper management of IP’s that are allocated by this provider, so IP’s that are no longer needed/used will also be released again.

Additionally the provider can now also work with CloudStack projects and advanced (VPC) networks.

Lastly the Zone interface now returns an actual zone (supplied by the cloud config), a few logical errors are fixed and the first few tests are added.

All the functionality is extensively tested against both basic and advanced (VPC) networks.