Fix H231 Python 3.x incompatible 'except x,y:'
Fix H231 Python 3.x incompatible 'except x,y:'

This is triggered in the pep8 check when using the syncronised
requirements versions.

Change-Id: Ie73c44b85025f79e7358303fab2697e076f7cabf

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