[WIP] Moving OpenStack networks definitions to barclamp-neutron

This is pull request for moving OpenStack Nova networks to barclamp-neutron.
This change will:

- simplify network configuration
- gives better flexibility for user deployments.

Warning!!! Please don't merge this until it will be tested

Depends on:

- crowbar/crowbar#2071
I think we're a missing a "conduit" setting here in order to be able select the physical device(s) a network should use. This is at least required when using networking mode "vlan" networks.