[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
This needs to be turned into a range now, I think. Previously we "computed" the range of vlans from the VLAN set for the ```nova_fixed``` network in the network.json + the ```num_vlans``` value from here.