Using node as a delegate currently fails

[asmodehn]

Broken example :

class ServerNode(object):
    def __init__(self, name):
        self.node = pyzmp.Node(name)
        self.the_answer = 42
        self.node.provides(self.question)
    def question(self):
        return self.the_answer
    def __enter__(self):
        return self.node.__enter__()
    def __exit__(self ,type, value, traceback):
        return self.node.__exit__(type, value, traceback)
    
with ServerNode("srv") as srv:
    question = pyzmp.discover("question")
    question.call()
    
[srv] Proc started as [5973]
Shutdown initiated

Traceback (most recent call last):
  File "<input>", line 3, in <module>
  File "/home/alexv/Projects/pyzmp/pyzmp/service.py", line 142, in call
    reraise(pickle.loads(svcexc.exc_type), pickle.loads(svcexc.exc_value), tb.as_traceback())
  File "/home/alexv/Projects/pyzmp/pyzmp/node.py", line 221, in receive_reply
    resp = self._providers[req.service].func(*request_args, **request_kwargs)
  File "<input>", line 7, in question
AttributeError: 'Node' object has no attribute 'the_answer'

This needs to be thoroughly investigated...

A simple workaround for now is to inherit from Node which works fine and is usually tested.