config-autogen: generate sort operation outside for loop

List operations in scale tests are inefficient due to incorrect
position of sort call.

Change-Id: Id695a55a48945806cd477a1520731f45fb691c56
Closes-Bug: #1416089
(cherry picked from commit 74b8b44)

ifmap_frontend.py

@@ -3229,10 +3229,10 @@ def _generate_cassandra_db_impl(self, gen_fname, gen_type_pfx):
             write(gen_file, "                    unsorted_fq_names_uuids.append({'fq_name': child_fq_name, 'uuid': child_uuid,")
             write(gen_file, "                                                    'tstamp': tstamp})")
             write(gen_file, "")
-            write(gen_file, "                    # sort children; TODO do this based on schema")
-            write(gen_file, "                    sorted_children = sorted(unsorted_fq_names_uuids, key = itemgetter('tstamp'))")
-            write(gen_file, "                    # re-write result's children without timestamp")
-            write(gen_file, "                    children_fq_names_uuids = [(child['fq_name'], child['uuid']) for child in sorted_children]")
+            write(gen_file, "            # sort children; TODO do this based on schema")
+            write(gen_file, "            sorted_children = sorted(unsorted_fq_names_uuids, key = itemgetter('tstamp'))")
+            write(gen_file, "            # re-write result's children without timestamp")
+            write(gen_file, "            children_fq_names_uuids = [(child['fq_name'], child['uuid']) for child in sorted_children]")
             write(gen_file, "        if back_ref_uuids:")
             write(gen_file, "            # go from anchor to backrefs")
             write(gen_file, "            obj_uuid_cf = self._obj_uuid_cf")