Convert to Python 3: `httplib` -> `http.client`

doc/examples/example_test.py

 #!/usr/bin/python
 
-import httplib
+import http.client
 import operator
 import subprocess
 import unittest
     def _get_data(self):
         pq = "op=%(op)s&a=%(a)s&b=%(b)s" % self._args
         parsed_url = urlparse.urlparse(self._settings['uri'])
-        conn = httplib.HTTPConnection(parsed_url.hostname)
+        conn = http.client.HTTPConnection(parsed_url.hostname)
         conn.request("GET", "%s?%s" % (parsed_url.path, pq))
         resp = conn.getresponse()
         assert resp.status == 200