Eliminate unreachable suppression

.pylintrc-tests

@@ -54,7 +54,6 @@ disable=
 	unnecessary-lambda,
 	wildcard-import,
 	line-too-long,
-	unreachable,
 	wrong-import-position,
 	wrong-import-order,
 	non-iterator-returned,

src/python/grpcio_tests/tests/testing/_server_application.py

@@ -38,7 +38,7 @@ class FirstServiceServicer(services_pb2_grpc.FirstServiceServicer):
             context.set_code(grpc.StatusCode.INVALID_ARGUMENT)
             context.set_details('Something is wrong with your request!')
         return
-        yield services_pb2.Strange()
+        yield services_pb2.Strange()  # pylint: disable=unreachable
 
     def StreUn(self, request_iterator, context):
         context.send_initial_metadata(((

src/python/grpcio_tests/tests/unit/beta/_beta_features_test.py

@@ -65,7 +65,7 @@ class _Servicer(object):
             self._serviced = True
             self._condition.notify_all()
             return
-            yield
+            yield  # pylint: disable=unreachable
 
     def stream_unary(self, request_iterator, context):
         for request in request_iterator: