Refs #24526 -- Made the django logger handle INFO messages.

Without an explicit 'level', only messages at WARNING or higher
are handled. This makes the config consistent with the docs
which say, "The django catch-all logger sends all messages at
the INFO level or higher to the console."

tests/runtests.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 import atexit
+import copy
 import logging
 import os
 import shutil
@@ -154,7 +155,7 @@ def setup(verbosity, test_labels, parallel):
         'contenttypes': 'contenttypes_tests.migrations',
         'sessions': 'sessions_tests.migrations',
     }
-    log_config = DEFAULT_LOGGING
+    log_config = copy.deepcopy(DEFAULT_LOGGING)
     # Filter out non-error logging so we don't have to capture it in lots of
     # tests.
     log_config['loggers']['django']['level'] = 'ERROR'