save list of locations to redis cache

inventory_provider/tasks/worker.py

@@ -146,8 +146,10 @@ def update_equipment_locations():
 
     with db.connection(InventoryTask.config["ops-db"]) as cx:
         for h in _derive_router_hostnames(InventoryTask.config):
-            for ld in opsdb.lookup_pop_info(cx, h):
-                r.set('opsdb:location:%s' % h, json.dumps(ld))
+            # lookup_pop_info returns a list of locations
+            # (there can sometimes be more than one match)
+            locations = list(opsdb.lookup_pop_info(cx, h))
+            r.set('opsdb:location:%s' % h, json.dumps(locations))
 
     logger.debug('<<< update_equipment_locations')