hide misleading ssl security warning in python>=2.7.9

[asottile-sentry]

urllib2 (python >=2.7.9) and urllib.request (python>=3.2) do validate ssl

for example:

$ docker run --rm -ti python:2.7.8-slim python -c 'import urllib2; urllib2.urlopen("https://expired.badssl.com")'
$ docker run --rm -ti python:2.7.9-slim python -c 'import urllib2; urllib2.urlopen("https://expired.badssl.com")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/local/lib/python2.7/urllib2.py", line 431, in open
    response = self._open(req, data)
  File "/usr/local/lib/python2.7/urllib2.py", line 449, in _open
    '_open', req)
  File "/usr/local/lib/python2.7/urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "/usr/local/lib/python2.7/urllib2.py", line 1240, in https_open
    context=self._context)
  File "/usr/local/lib/python2.7/urllib2.py", line 1197, in do_open
    raise URLError(err)
urllib2.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:581)>

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