Fix DB query call

Commit dfdf67a51b introduced a bulk
get for subnets. Two of the parameters for the "_get_collection"
API were switched (filters and dict_func) for the call. The
filters parameter is kwargs, but the dict_func is positional,
so we have to switch them back.

Change-Id: I81dbe7bd45858e5bb6fd43cb6030e594b1015325

gbpservice/neutron/plugins/ml2plus/plugin.py

@@ -629,8 +629,8 @@ class Ml2PlusPlugin(ml2_plugin.Ml2Plugin,
             # Also, older branches are a slight variation, in line with
             # upstream code.
             subnets_db = db_api.get_collection(context, models_v2.Subnet,
-                                               filters=filters,
                                                dict_func=None,
+                                               filters=filters,
                                                sorts=sorts,
                                                limit=limit,
                                                marker_obj=marker_obj,