use older yapf==0.28.0

tools/run_tests/xds_test_driver/framework/infrastructure/gcp/compute.py

@@ -50,8 +50,7 @@ class ComputeV1(gcp.api.GcpProjectApiResource):
         HTTP2 = enum.auto()
         GRPC = enum.auto()
 
-    def create_health_check_tcp(self,
-                                name,
+    def create_health_check_tcp(self, name,
                                 use_serving_port=False) -> GcpResource:
         health_check_settings = {}
         if use_serving_port:

tools/run_tests/xds_test_driver/framework/infrastructure/k8s.py

@@ -95,8 +95,7 @@ class KubernetesNamespace:
     def get_service_account(self, name) -> V1Service:
         return self.api.core.read_namespaced_service_account(name, self.name)
 
-    def delete_service(self,
-                       name,
+    def delete_service(self, name,
                        grace_period_seconds=DELETE_GRACE_PERIOD_SEC):
         self.api.core.delete_namespaced_service(
             name=name,

tools/run_tests/xds_test_driver/framework/rpc/__init__.py

@@ -42,8 +42,8 @@ class GrpcClientHelper:
             rpc: str,
             req: Message,
             wait_for_ready_sec: Optional[int] = DEFAULT_WAIT_FOR_READY_SEC,
-        connection_timeout_sec: Optional[int] = DEFAULT_CONNECTION_TIMEOUT_SEC
-    ) -> Message:
+            connection_timeout_sec: Optional[
+                int] = DEFAULT_CONNECTION_TIMEOUT_SEC) -> Message:
         if wait_for_ready_sec is None:
             wait_for_ready_sec = self.DEFAULT_WAIT_FOR_READY_SEC
         if connection_timeout_sec is None: