Pick up fixes in GAPIC generator. (#6490)

Includes fixes from these PRs:

- googleapis/gapic-generator#2407
- googleapis/gapic-generator#2396

google/cloud/automl_v1beta1/gapic/auto_ml_client.py

@@ -135,7 +135,7 @@ def __init__(self,
                  transport=None,
                  channel=None,
                  credentials=None,
-                 client_config=auto_ml_client_config.config,
+                 client_config=None,
                  client_info=None):
         """Constructor.
 
@@ -168,13 +168,20 @@ def __init__(self,
                 your own client library.
         """
         # Raise deprecation warnings for things we want to go away.
-        if client_config:
-            warnings.warn('The `client_config` argument is deprecated.',
-                          PendingDeprecationWarning)
+        if client_config is not None:
+            warnings.warn(
+                'The `client_config` argument is deprecated.',
+                PendingDeprecationWarning,
+                stacklevel=2)
+        else:
+            client_config = auto_ml_client_config.config
+
         if channel:
             warnings.warn(
                 'The `channel` argument is deprecated; use '
-                '`transport` instead.', PendingDeprecationWarning)
+                '`transport` instead.',
+                PendingDeprecationWarning,
+                stacklevel=2)
 
         # Instantiate the transport.
         # The transport is responsible for handling serialization and

google/cloud/automl_v1beta1/gapic/prediction_service_client.py

@@ -82,7 +82,7 @@ def __init__(self,
                  transport=None,
                  channel=None,
                  credentials=None,
-                 client_config=prediction_service_client_config.config,
+                 client_config=None,
                  client_info=None):
         """Constructor.
 
@@ -115,13 +115,20 @@ def __init__(self,
                 your own client library.
         """
         # Raise deprecation warnings for things we want to go away.
-        if client_config:
-            warnings.warn('The `client_config` argument is deprecated.',
-                          PendingDeprecationWarning)
+        if client_config is not None:
+            warnings.warn(
+                'The `client_config` argument is deprecated.',
+                PendingDeprecationWarning,
+                stacklevel=2)
+        else:
+            client_config = prediction_service_client_config.config
+
         if channel:
             warnings.warn(
                 'The `channel` argument is deprecated; use '
-                '`transport` instead.', PendingDeprecationWarning)
+                '`transport` instead.',
+                PendingDeprecationWarning,
+                stacklevel=2)
 
         # Instantiate the transport.
         # The transport is responsible for handling serialization and

google/cloud/automl_v1beta1/gapic/transports/auto_ml_grpc_transport.py

@@ -63,6 +63,8 @@ def __init__(self,
                 credentials=credentials,
             )
 
+        self._channel = channel
+
         # gRPC uses objects called "stubs" that are bound to the
         # channel and provide a basic method for each RPC.
         self._stubs = {
@@ -98,6 +100,15 @@ def create_channel(cls,
             scopes=cls._OAUTH_SCOPES,
         )
 
+    @property
+    def channel(self):
+        """The gRPC channel used by the transport.
+
+        Returns:
+            grpc.Channel: A gRPC channel object.
+        """
+        return self._channel
+
     @property
     def create_dataset(self):
         """Return the gRPC stub for {$apiMethod.name}.

google/cloud/automl_v1beta1/gapic/transports/prediction_service_grpc_transport.py

@@ -62,6 +62,8 @@ def __init__(self,
                 credentials=credentials,
             )
 
+        self._channel = channel
+
         # gRPC uses objects called "stubs" that are bound to the
         # channel and provide a basic method for each RPC.
         self._stubs = {
@@ -92,6 +94,15 @@ def create_channel(cls,
             scopes=cls._OAUTH_SCOPES,
         )
 
+    @property
+    def channel(self):
+        """The gRPC channel used by the transport.
+
+        Returns:
+            grpc.Channel: A gRPC channel object.
+        """
+        return self._channel
+
     @property
     def predict(self):
         """Return the gRPC stub for {$apiMethod.name}.