glance image-create --locations=<...> always fails

[Tomoki Sekiyama]

In python-glanceclient, image-create (v2) will always fail with the error below when --location or --locations option is specified.

 % export OS_IMAGE_API_VERSION=2
 % glance image-create --disk-format=raw --container-format=bare --locations '{...}'

 Failed validating u'type' in schema[u'properties'][u'locations'][u'items']:
     {u'properties': {u'metadata': {u'type': u'object'},
                      u'url': {u'maxLength': 255, u'type': u'string'}},
      u'required': [u'url', u'metadata'],
      u'type': u'object'}

 On instance[u'locations'][0]:
     u'{...}'

This seems to be because glance client doesn't parse the option argument and pass as a string.
The argument should be parsed, or --locations option should be omitted from the option list.