Fix uuid warnings from test_db_api unit tests
Fix uuid warnings from test_db_api unit tests

The test_db_api unit tests emit FutureWarnings [1] from
oslo_versioned_objects due to use of invalid faked test values.

This commit uses fake values from cinder/tests/unit/fake_constants.py
to clean up these warnings consistent with other similar cleanups in
the codebase.

[1] http://docs.openstack.org/developer/oslo.versionedobjects/api/fields.html#oslo_versionedobjects.fields.UUIDField

Change-Id: Ib0b38bac57a62ffbb0e71729193efc7039956a35

phenoxim/cinder,mahak/cinder,Hybrid-Cloud/cinder,NetApp/cinder,bswartz/cinder,cloudbase/cinder,cloudbase/cinder,eharney/cinder,mahak/cinder,NetApp/cinder,openstack/cinder,phenoxim/cinder,bswartz/cinder,Datera/cinder,eharney/cinder,j-griffith/cinder,Hybrid-Cloud/cinder,Datera/cinder,Nexenta/cinder,j-griffith/cinder,openstack/cinder,ge0rgi/cinder,Nexenta/cinder