python3 compatibility for failing unit tests

Handle StopIteration for Py3.7. PEP 0479,
https://www.python.org/dev/peps/pep-0479/, makes the following
change: "when StopIteration is raised inside a generator, it is
replaced it with RuntimeError". And states: "If raise StopIteration
occurs directly in a generator, simply replace it with return."

Also fix test cases that make assumptions about the ordering of
**kwargs. Python, up to 3.6, doesn't preserve any ordering for those.
And the behavior differs between various Python versions.
For details see PEP 0468 (https://www.python.org/dev/peps/pep-0468/)

Change-Id: I9847053534ffd47c4559d504be647be0de25b651
Closes-Bug: #1784714
Closes-Bug: #1711469

glareclient/tests/unit/v1/test_artifacts.py

@@ -50,17 +50,19 @@ class TestController(testtools.TestCase):
         body = self.c.update('test-id', type_name='test_name',
                              remove_props=remove_props, update1=1, update2=2)
         self.assertEqual(self.mock_body, body)
-        patch_kwargs = {
-            'headers': {'Content-Type': 'application/json-patch+json'},
-            'json': [
-                {'path': '/remove1', 'value': None, 'op': 'replace'},
-                {'path': '/remove2', 'value': None, 'op': 'replace'},
-                {'path': '/update2', 'value': 2, 'op': 'add'},
-                {'path': '/update1', 'value': 1, 'op': 'add'}
-            ]
-        }
-        self.mock_http_client.patch.assert_called_once_with(
-            '/artifacts/checked_name/test-id', **patch_kwargs)
+        headers = {'Content-Type': 'application/json-patch+json'}
+        json = [
+            {'path': '/remove1', 'value': None, 'op': 'replace'},
+            {'path': '/remove2', 'value': None, 'op': 'replace'},
+            {'path': '/update1', 'value': 1, 'op': 'add'},
+            {'path': '/update2', 'value': 2, 'op': 'add'}
+        ]
+
+        args, kwargs = self.mock_http_client.patch.call_args
+        self.assertEqual(args, ('/artifacts/checked_name/test-id',))
+        self.assertEqual(kwargs['headers'], headers)
+        sorted_json = sorted(kwargs['json'], key=lambda k: k['path'])
+        self.assertEqual(sorted_json, json)
         self.c._check_type_name.assert_called_once_with('test_name')
 
     def test_get(self):
@@ -169,7 +171,7 @@ class TestController(testtools.TestCase):
         schemas = {'schemas': {'a': {'version': 1}, 'b': {'version': 2}}}
         self.mock_http_client.get.return_value = (None, schemas)
         expected_types = [('a', 1), ('b', 2)]
-        self.assertEqual(expected_types, self.c.get_type_list())
+        self.assertEqual(expected_types, sorted(self.c.get_type_list()))
 
     def test_get_type_schema(self):
         test_schema = {'schemas': {'checked_name': 'test-schema'}}

glareclient/v1/artifacts.py

@@ -171,7 +171,7 @@ class Controller(object):
                     if limit:
                         limit -= 1
                         if limit <= 0:
-                            raise StopIteration
+                            return
 
                 try:
                     next_url = body['next']