nova api value error is not right

[Guangya Liu (Jay Lau)]

I was trying to add a json field to DB but forget to dumps the json to string, and nova api report the following error.

2013-12-17 12:37:51.615 TRACE object Traceback (most recent call last):
2013-12-17 12:37:51.615 TRACE object File "/opt/stack/nova/nova/objects/base.py", line 70, in setter
2013-12-17 12:37:51.615 TRACE object field.coerce(self, name, value))
2013-12-17 12:37:51.615 TRACE object File "/opt/stack/nova/nova/objects/fields.py", line 166, in coerce
2013-12-17 12:37:51.615 TRACE object return self._type.coerce(obj, attr, value)
2013-12-17 12:37:51.615 TRACE object File "/opt/stack/nova/nova/objects/fields.py", line 218, in coerce
2013-12-17 12:37:51.615 TRACE object raise ValueError(_('A string is required here, not %s'),
2013-12-17 12:37:51.615 TRACE object ValueError: (u'A string is required here, not %s', 'dict') <<<<<<<<<<<

The error should be <string is required here, not dict>

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/62552

[Guangya Liu (Jay Lau) (jay-lau-513)]

This patch has been merged.