Open message can now be send to the helper application.

Fixes the following bug:
```Text
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   | reactor       | peer 192.168.33.12 ASN 4       UNHANDLED PROBLEM, please report
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   | reactor       | peer 192.168.33.12 ASN 4       <type 'exceptions.TypeError'>
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   | reactor       | peer 192.168.33.12 ASN 4       message() takes exactly 6 arguments (7 given)
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               | Traceback (most recent call last):
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               |   File "/home/vagrant/venv/lib/python2.6/site-packages/exabgp/reactor/peer.py", line 564, in _run
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               |     for action in self._[direction]['code']():
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               |   File "/home/vagrant/venv/lib/python2.6/site-packages/exabgp/reactor/peer.py", line 320, in _connect
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               |     for message in proto.new_open(self._restarted):
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               |   File "/home/vagrant/venv/lib/python2.6/site-packages/exabgp/reactor/protocol.py", line 241, in new_open
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               |     self.peer.reactor.processes.message(Message.ID.OPEN,self.peer,'sent',sent_open,header,body)
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               | TypeError: message() takes exactly 6 arguments (7 given)
Thu, 17 Jul 2014 10:47:30 | ERROR    | 4225   |               | 
Thu, 17 Jul 2014 10:47:30 | INFO     | 4225   | network       | Peer   192.168.33.12 ASN 4       out loop reset  
^CThu, 17 Jul 2014 10:47:31 | INFO     | 4225   | reactor       | ^C received
Thu, 17 Jul 2014 10:47:31 | INFO     | 4225   | reactor       | Performing shutdown
```