This helper is a way to unify the way of usage Neutron API and remove code
duplication.
- NeutronWrapper was developed with a compatible to NovaNetworkWrapper
interface. This means a lot of limitations that was introduced from
the beggining
- NeutronUtils was build on top of Scenario plugin class that makes it
hard to be reusable from context objects
Change-Id: Ie87d5145c3b58f961fc56fe6375860919416318d