Use DBReferenceError in archive_deleted_rows_for_table
Use DBReferenceError in archive_deleted_rows_for_table

There is an old TODO in here to switch from the generic DBError to
DBReferenceError, which was added to oslo.db in commit a9e3af2eb back in
the 0.4.0 release so we're safe to use this now.

Change-Id: Ifb3d8890827a6bbc782c15b6d4fd3902dbb5dacf

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