Remove Fn::FindInMap from HOT
Remove Fn::FindInMap from HOT

Since HOT doesn't include a Mappings section, this function can't ever do
anything useful.

Change-Id: I669b5516e13927f2b9d28f15dd2d728f27fd4a43

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