Adds configurable ajax connection queueing.

Fixes bug 965910.

Change-Id: I84807f6ca0d9769d25b942c151c1a83501648a0a

horizon/context_processors.py

@@ -51,7 +51,8 @@ def horizon(request):
         for each template/template fragment which takes context that is used
         to render the complete output.
     """
-    context = {"True": True,
+    context = {"HORIZON_CONFIG": getattr(settings, "HORIZON_CONFIG", {}),
+               "True": True,
                "False": False}
 
     # Auth/Keystone context