Add a specific tower warnings file in the tower home directory.

Configure the api viewer to emit warnings for 4XX and 5XX status codes
into that file.  Configure it for use on a production system.  Closes AC-685

awx/api/generics.py

@@ -3,6 +3,7 @@
 
 # Python
 import inspect
+import logging
 import json
 
 # Django
@@ -31,6 +32,8 @@ __all__ = ['APIView', 'GenericAPIView', 'ListAPIView', 'SimpleListAPIView',
            'RetrieveAPIView', 'RetrieveUpdateAPIView',
            'RetrieveDestroyAPIView', 'RetrieveUpdateDestroyAPIView']
 
+logger = logging.getLogger('awx.api.generics')
+
 def get_view_name(cls, suffix=None):
     '''
     Wrapper around REST framework get_view_name() to support get_name() method
@@ -131,6 +134,11 @@ class APIView(views.APIView):
         ret['added_in_version'] = added_in_version
         return ret
 
+    def finalize_response(self, request, response, *args, **kwargs):
+        if response.status_code >= 400:
+            logger.warn("status %s received by user %s attempting to access %s" % (response.status_code, request.user, request.path))
+        return super(APIView, self).finalize_response(request, response, *args, **kwargs)
+
 
 class GenericAPIView(generics.GenericAPIView, APIView):
     # Base class for all model-based views.