Updated openstack/openstack
Project: openstack/nova  6775df9047d20d1fc906c3a1b7d7e8b36188f491

Fix error status code for cloudpipe_update

When passing bad body in a request, most APIs return BadRequest response.
However, cloudpipe_update API doesn't do it.
This patch fixes the error status code and adds a unit test related to
this change.

Change-Id: I16a48e6913f52baa870e04196529fda619c03098