imagery: use new fastly test cdn url
imagery: use new fastly test cdn url

openstreetmap/chef,zerebubuth/openstreetmap-chef,tomhughes/openstreetmap-chef,openstreetmap/chef,zerebubuth/openstreetmap-chef,tomhughes/openstreetmap-chef,openstreetmap/chef,zerebubuth/openstreetmap-chef,openstreetmap/chef,openstreetmap/chef,tomhughes/openstreetmap-chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef,openstreetmap/chef,openstreetmap/chef,tomhughes/openstreetmap-chef,openstreetmap/chef,tomhughes/openstreetmap-chef