Fix backward compatibility with twisted 13.1 in ooniprobe
Currently ooniprobe requires twisted API 13.1. When running ooniprobe with an older version you will get this error message:
Traceback (most recent call last):
File "/usr/bin/ooniprobe", line 16, in <module>
from ooni.oonicli import runWithDirector
File "/usr/lib/python2.7/dist-packages/ooni/oonicli.py", line 11, in
<module>
from ooni.settings import config
File "/usr/lib/python2.7/dist-packages/ooni/settings.py", line 7, in
<module>
from twisted.internet.endpoints import TCP4ClientEndpoint,
connectProtocol
ImportError: cannot import name connectProtocol