Make that ContextInjector thing jsonifiable.

roles/fedmsg_base/templates/logging.py.j2

@@ -61,6 +61,11 @@ class ContextInjector(logging.Filter):
         # This should be impossible.
         raise ValueError("Could not find process %r" % mypid)
 
+    @classmethod
+    def __json__(cls):
+        """ We need to be jsonifiable for "fedmsg-config" """
+        return {'name': 'ContextInjector'}
+
 
 current_process = ContextInjector.get_current_process()
 current_hostname = socket.gethostname()