Ensure backwards compatibility for previous versions of obfsproxy (managed mode)

[kpdyer]

When running in managed mode we need to support all versions of obfsproxy in the 0.2.x chain.

Currently, we are getting

Traceback (most recent call last):
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/twisted/python/log.py", line 88, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/twisted/python/log.py", line 73, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/twisted/python/context.py", line 118, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/twisted/python/context.py", line 81, in callWithContext
    return func(*args,**kw)
--- <exception caught here> ---
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/twisted/internet/selectreactor.py", line 151, in _doReadOrWrite
    why = getattr(selectable, method)()
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/twisted/internet/tcp.py", line 215, in doRead
    return self._dataReceived(data)
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/twisted/internet/tcp.py", line 221, in _dataReceived
    rval = self.protocol.dataReceived(data)
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/obfsproxy/network/socks.py", line 116, in dataReceived
    self.circuit.dataReceived(self.buffer, self)
  File "/Applications/TorBrowser.app/Tor/PluggableTransports/obfsproxy/network/network.py", line 154, in dataReceived
    self.transport.receivedUpstream(data, self)
exceptions.TypeError: receivedUpstream() takes exactly 2 arguments (3 given)

on obfsproxy 0.2.4. (As tested on OSX.)

[kpdyer]

Resolved.