Fix JSON formatting in AWS LoadBalancer template
Fix JSON formatting in AWS LoadBalancer template

There is one extra coma making the JSON invalid

Change-Id: Icec73b800bccb9446d4aaf284c90329f0d4edbc3

rh-s/heat,srznew/heat,srznew/heat,gonzolino/heat,rh-s/heat,cwolferh/heat-scratch,noironetworks/heat,dims/heat,steveb/heat,noironetworks/heat,cryptickp/heat,pshchelo/heat,takeshineshiro/heat,maestro-hybrid-cloud/heat,openstack/heat,pshchelo/heat,pratikmallya/heat,cryptickp/heat,jasondunsmore/heat,dragorosson/heat,openstack/heat,jasondunsmore/heat,pratikmallya/heat,cwolferh/heat-scratch,rdo-management/heat,dragorosson/heat,gonzolino/heat,miguelgrinberg/heat,rdo-management/heat,dims/heat,steveb/heat,takeshineshiro/heat,miguelgrinberg/heat,maestro-hybrid-cloud/heat