fix prefetch -> stream because of requests upgrade (bug 864075)

appvalidator/testcases/webappbase.py

@@ -155,7 +155,7 @@ def try_get_resource(err, package, url, filename, resource_type="URL",
             filename=filename)
 
     try:
-        request = requests.get(url, prefetch=False, allow_redirects=True,
+        request = requests.get(url, stream=True, allow_redirects=True,
                                timeout=3, headers=HEADERS)
         data = request.raw.read(constants.MAX_RESOURCE_SIZE)
         # Check that there's not more data than the max size.

tests/test_webapp_resources.py

@@ -100,7 +100,7 @@ class TestResourceExceptions(TestCase):
                 appbase.try_get_resource(self.err, None, "/zip/zap", "")
             except DummyException:
                 requests_get.assert_called_once_with(
-                    "ftp://test.com/zip/zap", prefetch=False,
+                    "ftp://test.com/zip/zap", stream=True,
                     allow_redirects=True, timeout=3, headers=appbase.HEADERS)
             else:
                 raise AssertionError("Should have gotten DummyException")