Eliminate unnecessary-lambda suppression

.pylintrc-tests

@@ -50,7 +50,6 @@ disable=
 	too-many-return-statements,
 	too-many-statements,
 	function-redefined,
-	unnecessary-lambda,
 	wildcard-import,
 	line-too-long,
 	wrong-import-position,

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

@@ -52,9 +52,9 @@ class _MethodHandler(grpc.RpcMethodHandler):
         self.stream_unary = None
         self.stream_stream = None
         if self.request_streaming and self.response_streaming:
-            self.stream_stream = lambda x, y: handle_stream(x, y)
+            self.stream_stream = handle_stream
         elif not self.request_streaming and not self.response_streaming:
-            self.unary_unary = lambda x, y: handle_unary(x, y)
+            self.unary_unary = handle_unary
 
 
 class _GenericHandler(grpc.GenericRpcHandler):