set default log level to warn, fix clean_nonces not working

helm/passbook/templates/passbook-configmap.yaml

@@ -15,8 +15,8 @@ data:
         port: ''
     log:
       level:
-        console: DEBUG
-        file: DEBUG
+        console: WARNING
+        file: WARNING
       file: /dev/null
       syslog:
         host: 127.0.0.1

passbook/core/tasks.py

@@ -24,5 +24,5 @@ def send_email(to_address, subject, template, context):
 @CELERY_APP.task()
 def clean_nonces():
     """Remove expired nonces"""
-    amount = Nonce.objects.filter(expires__lt=datetime.now(), expiring=True).delete()
+    amount, _ = Nonce.objects.filter(expires__lt=datetime.now(), expiring=True).delete()
     LOGGER.debug("Deleted expired %d nonces", amount)