Handle instances without attached ports. #772
Draft
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This change covers the case where an instance has no ports (addresses)
attached making the function network_name_from_instance() raise a
StopIteration since the "addresses" dict is empty.
Traceback (most recent call last):
File "[...]/zaza/openstack/charm_tests/manila/tests.py", line 142, in tearDownClass
fips_reservations += neutron_tests.floating_ips_from_instance(vm)
File "[...[/zaza/openstack/charm_tests/neutron/tests.py", line 1028, in floating_ips_from_instance
return ips_from_instance(instance, 'floating')
File "[...]/zaza/openstack/charm_tests/neutron/tests.py", line 1073, in ips_from_instance
network_name_from_instance(instance)]
File "[...]/zaza/openstack/charm_tests/neutron/tests.py", line 1052, in network_name_from_instance
return next(iter(instance.addresses))
StopIteration
Fixes #771