Fix test issue with initdb

Non-sqlite DBs don't like maxvalue for Integer

initdb.py

@@ -5,7 +5,6 @@ import random
 import calendar
 import os
 
-from sys import maxsize
 from datetime import datetime, timedelta
 from peewee import (SqliteDatabase, create_model_tables, drop_model_tables, savepoint_sqlite,
                     savepoint)
@@ -97,7 +96,7 @@ def __create_subtree(repo, structure, creator_username, parent, tag_map):
         store.put_content('local_us', path, checksum)
 
     new_image.security_indexed = False
-    new_image.security_indexed_engine = maxsize
+    new_image.security_indexed_engine = -1
     new_image.save()
 
     creation_time = REFERENCE_DATE + timedelta(weeks=image_num) + timedelta(days=model_num)