unexplained issue, requesting a more significative message

[stonebig]

Hi all,

I have error reports I can't explain, like winpython/winpython#582.

  File "B:\P\python-3.6.3.amd64\lib\site-packages\jupyter_client\manager.py", line 234, in start_kernel
    "Currently valid addresses are: %s" % local_ips()
RuntimeError: Can only launch a kernel on a local interface. Make sure that the '*_address' attributes are configured properly. Currently valid addresses are: ['130.216.54.47', '0.0.0.0', '']
```

Would it be possible top make the error message more complete in manager_py  ?  

        raise RuntimeError("Can only launch a kernel on a local interface. "
                           "This one is not: %s."
                           "Make sure that the '*_address' attributes are "
                           "configured properly. "
                           "Currently valid addresses are: %s" % (self.ip, local_ips())
                           )

[minrk]

fixed by #330