Fix auth failed exception handler
Fix auth failed exception handler

This patch fixes the auth failed exception handler so that we
get back a meaningful result when authentication fails.

Change-Id: I2f37daed3890fd685fa6f701938b675460e76b0c
Signed-off-by: Ian Main <87edab3227c32093d388ed00258c1a5e63cfd715@redhat.com>

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