temp hack to not clean up database

Author: ohmayr

packages/django-google-spanner/tests/system/django_spanner/utils.py

@@ -125,6 +125,5 @@ def setup_database():
 
 
 def teardown_database():
-    Config.DATABASE = Config.INSTANCE.database(DATABASE_NAME)
-    if Config.DATABASE.exists():
-        Config.DATABASE.drop()
+    # temporary hack
+    pass