Fixed #14861 -- Moved logging config outside of Settings.__init__

Thanks donspaulding for the report and simonpercivall for the
initial patch.

docs/topics/logging.txt

@@ -345,36 +345,6 @@ This logging configuration does the following things:
     printed to the console; ``ERROR`` and ``CRITICAL``
     messages will also be output via email.
 
-.. admonition:: Custom handlers and circular imports
-
-    If your ``settings.py`` specifies a custom handler class and the file
-    defining that class also imports ``settings.py`` a circular import will
-    occur.
-
-    For example, if ``settings.py`` contains the following config for
-    :setting:`LOGGING`::
-
-        LOGGING = {
-          'version': 1,
-          'handlers': {
-            'custom_handler': {
-              'level': 'INFO',
-              'class': 'myproject.logconfig.MyHandler',
-            }
-          }
-        }
-
-    and ``myproject/logconfig.py`` has the following line before the
-    ``MyHandler`` definition::
-
-        from django.conf import settings
-
-    then the ``dictconfig`` module will raise an exception like the following::
-
-        ValueError: Unable to configure handler 'custom_handler':
-        Unable to configure handler 'custom_handler':
-        'module' object has no attribute 'logconfig'
-
 .. _formatter documentation: http://docs.python.org/library/logging.html#formatter-objects
 
 Custom logging configuration