Comment 9 for bug 1341096

in original intent, we shuld not pass in metadata words such as {} or []. I don't know when we have this ability.
the right way to do this is:
neutron port-update 55b72fe9-2c8b-4ada-b071-9e41b87454cd --fixed-ips type=dict list=true subnet_id=c256df04-550d-4ad2-87ec-3ec725799a07,ip_address=192.168.0.15 subnet_id=c256df04-550d-4ad2-87ec-3ec725799a07,ip_address=192.168.0.16