Ignore some python formatting errors for licenses

# Motivation

We want to lint our python files but also need to include our license header.

# Modification

This PR ignores a few python flake rules to make sure the license headers pass.

# Result

Passing license headers.

Author: FranzBusch

.github/workflows/soundness.yml

@@ -218,4 +218,4 @@ jobs:
         run: |
           pip3 install flake8 flake8-import-order
           cd ${GITHUB_WORKSPACE}
-          flake8
+          flake8 --extend-ignore=E265,E266,E501

tests/test.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift.org open source project
+##
+## Copyright (c) 2020 Apple Inc. and the Swift.org project authors
+## Licensed under Apache License v2.0
+##
+## See LICENSE.txt for license information
+## See CONTRIBUTORS.txt for the list of Swift.org project authors
+##
+## SPDX-License-Identifier: Apache-2.0
+##
+##===----------------------------------------------------------------------===##