Comment 10 for bug 1556917

Reproduced on 8.0 without updates with error like in #1 post

But when verification on 8.0+(mu3-proposed) I got other error in same moment:
  File "/usr/lib/python2.7/site-packages/nailgun/orchestrator/neutron_serializers.py", line 64, in network_provider_node_attrs
    'network_scheme': cls.generate_network_scheme(node, networks),
  File "/usr/lib/python2.7/site-packages/nailgun/orchestrator/neutron_serializers.py", line 1255, in generate_network_scheme
    netgroups[public_net]['gateway']
KeyError: u'public'

Full trace: http://paste.openstack.org/show/rPXMKzzkeQCuYzfiMaKp/

Fail at line: https://github.com/openstack/fuel-web/blob/stable/8.0/nailgun/nailgun/orchestrator/neutron_serializers.py#L1254-L1255

In both cases used template: https://raw.githubusercontent.com/openstack/fuel-qa/stable/8.0/fuelweb_test/network_templates/two_nodegroups.yaml