Fix Instance unit test for DBReferenceError
Fix Instance unit test for DBReferenceError

Currently, test_save_objectfield_missing_instance_row isn't reaching
the code where DBReferenceError is handled in Instance.save and the
test is passing because lazy-loading of fields is raising
InstanceNotFound.

This change passes all fields as expected_attrs when creating the
fake Instance object.

Change-Id: I22f504b877007143f2e760f47495f3f9a688e5fb

mahak/nova,raildo/nova,rajalokan/nova,cyx1231st/nova,Juniper/nova,mikalstill/nova,Juniper/nova,NeCTAR-RC/nova,raildo/nova,apporc/nova,openstack/nova,NeCTAR-RC/nova,gooddata/openstack-nova,apporc/nova,klmitch/nova,jianghuaw/nova,devendermishrajio/nova,sebrandon1/nova,bigswitch/nova,cernops/nova,rajalokan/nova,cloudbase/nova,jianghuaw/nova,cernops/nova,phenoxim/nova,zhimin711/nova,dims/nova,gooddata/openstack-nova,bigswitch/nova,cloudbase/nova,BeyondTheClouds/nova,CEG-FYP-OpenStack/scheduler,rahulunair/nova,vmturbo/nova,rahulunair/nova,sebrandon1/nova,cyx1231st/nova,vmturbo/nova,klmitch/nova,alaski/nova,klmitch/nova,vmturbo/nova,fnordahl/nova,openstack/nova,devendermishrajio/nova,BeyondTheClouds/nova,vmturbo/nova,jianghuaw/nova,mikalstill/nova,gooddata/openstack-nova,gooddata/openstack-nova,zhimin711/nova,jianghuaw/nova,Juniper/nova,rahulunair/nova,rajalokan/nova,rajalokan/nova,hanlind/nova,hanlind/nova,CEG-FYP-OpenStack/scheduler,alaski/nova,dims/nova,cloudbase/nova,BeyondTheClouds/nova,mikalstill/nova,fnordahl/nova,klmitch/nova,cernops/nova,mahak/nova,mahak/nova,sebrandon1/nova,openstack/nova,hanlind/nova,phenoxim/nova,Juniper/nova