Updated openstack/openstack
Project: openstack/nova  f9bb7be91f978f8830eb0c112b34bd1922a02e80

objects: remove unused utils module

The nova.objects.utils module appears unused since commit 91a89f4 when
we finished refactoring the code into nova.objects.fields.

Change-Id: I1468172f823e362eca7f152ba282982fb5b41f35