[upgrade] Upgrade kilo->liberty cluster deployed with network templates: failed to move node between clusters: KeyError: u'murano'

7.0MU5
8.0MU2+latest proposed packages
nailgun package version fuel-nailgun-8.0.0-1.mos8270.noarch
snapshot is not available due to backslash escaping issue

Steps to reproduce:
1 - Deploy 7.0 fuel + HA + ceph cluster using network template [1] (autotest at [2])
2 - Upgrade master node to 8.0 + latest MU (ensure that nailgun package version is 8270 or above)
3 - Download network template from cluster (fuel --env 1 network-template --download)
4 - Modify network template according to doc (switch default nic mapping to enp0s* names and create additional sections per each host in old cluster with eth* names)
5 - octane upgrade-env --template {file} {ENV_ID}
6 - octane upgrade-node --isolated {SEED_ID} {PRIMARY_CTRL_ID}

Result:
2016-08-24 20:19:12 ERROR octane.util.subprocess fuel2[27709] stderr: 500 Server Error: Internal Server Error

nailgun/app.log:

2016-08-24 20:19:12.863 ERROR [7f1b3dada880] (base) Unexpected exception occured
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nailgun/api/v1/handlers/base.py", line 283, in content_json
    resp = func(cls, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/nailgun/extensions/cluster_upgrade/handlers.py", line 88, in POST
    upgrade.UpgradeHelper.assign_node_to_cluster(node, cluster)
  File "/usr/lib/python2.7/site-packages/nailgun/extensions/cluster_upgrade/upgrade.py", line 179, in assign_node_to_cluster
    orig_cluster, seed_cluster)
  File "/usr/lib/python2.7/site-packages/nailgun/extensions/cluster_upgrade/upgrade.py", line 196, in get_netgroups_id_mapping
    mapping = dict((ng.id, seed_ng_dict[ng.name]) for ng in orig_ng)
  File "/usr/lib/python2.7/site-packages/nailgun/extensions/cluster_upgrade/upgrade.py", line 196, in <genexpr>
    mapping = dict((ng.id, seed_ng_dict[ng.name]) for ng in orig_ng)
KeyError: u'murano'

[1] https://github.com/openstack/fuel-qa/blob/stable/7.0/fuelweb_test/network_templates/upgrades.yaml
[2] https://github.com/openstack/fuel-qa/blob/stable/7.0/fuelweb_test/network_templates/upgrades.yaml