Fix undefined LOG variable in db.session
Fix undefined LOG variable in db.session

Signed-off-by: Angus Salkeld <86b65304d27d8de73dd7d624c33df7e088f8d94b@redhat.com>

takeshineshiro/heat,pshchelo/heat,pshchelo/heat,openstack/heat-cfntools,rdo-management/heat,sdake/heat-jeos,NeCTAR-RC/heat,cwolferh/heat-scratch,dragorosson/heat,takeshineshiro/heat,rh-s/heat,ntt-sic/heat,dims/heat,JioCloud/heat,srznew/heat,steveb/heat-cfntools,citrix-openstack-build/heat,redhat-openstack/heat,maestro-hybrid-cloud/heat,srznew/heat,noironetworks/heat,varunarya10/heat,rickerc/heat_audit,rickerc/heat_audit,steveb/heat,dragorosson/heat,gonzolino/heat,NeCTAR-RC/heat,Triv90/Heat,gonzolino/heat,cryptickp/heat,rh-s/heat,miguelgrinberg/heat,Triv90/Heat,miguelgrinberg/heat,pratikmallya/heat,redhat-openstack/heat,jasondunsmore/heat,steveb/heat,varunarya10/heat,JioCloud/heat,Triv90/Heat,steveb/heat-cfntools,jasondunsmore/heat,noironetworks/heat,ntt-sic/heat,cryptickp/heat,bbandaru/heat-cfntools,rdo-management/heat,citrix-openstack-build/heat,maestro-hybrid-cloud/heat,openstack/heat,dims/heat,cwolferh/heat-scratch,pratikmallya/heat,openstack/heat