unit tests: Fix types in Fn::ResourceFacade tests
unit tests: Fix types in Fn::ResourceFacade tests

The Metadata and UpdatePolicy sections of a template contain maps, not
strings.

Change-Id: I09288cc87be8d9927142107ced7d6835897a5428

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