fix invalid uuid warnings from test_quota
fix invalid uuid warnings from test_quota

The test_quota unit tests are emitting several 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 this test module consistent with similar cleanups in the
codebase.

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

Change-Id: I57565145f425a6be92b7bbd3dfff2d04eb760cc6

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