Can not add node to deployed to env deployed with network templates

[Dmitry Ukov]

Steps to reproduce
1. Create env
2. Add network called san
   fuel2 network-group create -N 1 -C 172.17.32.64/27 -V 1362 -g 172.17.32.65 san
3. Upload network-template (see attachment)
4. Add controllers/computes
5. Deploy environment
6. Try to add new compute node to environment

Expected result:
  Node added to env with "Pending Addition" Status
Actual result:
  Error in Fuel UI

Logs show following error
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nailgun/api/v1/handlers/base.py", line 285, in content_json
    resp = func(cls, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/nailgun/api/v1/handlers/network_configuration.py", line 178, in PUT
    objects.Cluster.set_network_template(cluster, template)
  File "/usr/lib/python2.7/site-packages/nailgun/objects/cluster.py", line 1287, in set_network_template
    cls.update_nodes_network_template(instance, instance.nodes)
  File "/usr/lib/python2.7/site-packages/nailgun/objects/cluster.py", line 1301, in update_nodes_network_template
    Node.apply_network_template(node, template)
  File "/usr/lib/python2.7/site-packages/nailgun/objects/node.py", line 1224, in apply_network_template
    nm.assign_networks_by_template(instance)
  File "/usr/lib/python2.7/site-packages/nailgun/network/neutron.py", line 483, in assign_networks_by_template
    node_ifaces[iface]['id'] = nic.id
AttributeError: 'NoneType' object has no attribute 'id'

Diagnostic Snapshot:

[Dmitry Ukov (dukov)]

This issue is due different interface naming for new nodes. I'd suggest more informative logging here