Add a celery setting namespace.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/settings.py

@@ -241,3 +241,26 @@ setting_django_databases = namespace.add_setting(
         'DATA_UPLOAD_MAX_MEMORY_SIZE.'
     ),
 )
+
+namespace = Namespace(name='celery', label=_('Celery'))
+
+setting_celery_broker_url = namespace.add_setting(
+    global_name='BROKER_URL', default=settings.BROKER_URL,
+    help_text=_(
+        'Default: "amqp://". Default broker URL. This must be a URL in '
+        'the form of: transport://userid:password@hostname:port/virtual_host '
+        'Only the scheme part (transport://) is required, the rest is '
+        'optional, and defaults to the specific transports default values.'
+    ),
+)
+
+setting_celery_result_backend = namespace.add_setting(
+    global_name='CELERY_RESULT_BACKEND',
+    default=settings.CELERY_RESULT_BACKEND,
+    help_text=_(
+        'Default: No result backend enabled by default. The backend used '
+        'to store task results (tombstones). Refer to '
+        'http://docs.celeryproject.org/en/v4.1.0/userguide/configuration.'
+        'html#result-backend'
+    )
+)