Fix API

src/python/grpcio/grpc/__init__.py

@@ -2144,6 +2144,9 @@ __all__ = (
     'protos',
     'services',
     'protos_and_services',
+    'xds_channel_credentials',
+    'xds_server_credentials',
+    'insecure_server_credentials',
 )
 
 ############################### Extension Shims ################################

src/python/grpcio_tests/tests/unit/_api_test.py

@@ -87,6 +87,9 @@ class AllTest(unittest.TestCase):
             'protos',
             'services',
             'protos_and_services',
+            'xds_channel_credentials',
+            'xds_server_credentials',
+            'insecure_server_credentials',
         )
 
         six.assertCountEqual(self, expected_grpc_code_elements,