Bug 1530846: fix issue when installing hostutils r=gbrown

Per https://pythonhosted.org/six/index.html, urlopen resides in urllib.request.

Differential Revision: https://phabricator.services.mozilla.com/D21277

--HG--
extra : moz-landing-system : lando

testing/mozbase/mozrunner/mozrunner/devices/android_device.py

@@ -827,7 +827,7 @@ def _log_info(text):
 
 def _download_file(url, filename, path):
     _log_debug("Download %s to %s/%s..." % (url, path, filename))
-    f = urllib.urlopen(url)
+    f = urllib.request.urlopen(url)
     if not os.path.isdir(path):
         try:
             os.makedirs(path)