Fix Python shebang and license for presubmit_test.py

This was missed during review of https://codereview.webrtc.org/3010153002
Having python2 in the shebang makes it fail presubmit locally on Mac.

Disable 'invalid-name' PyLint rule in 3 places to pass presubmit.

NOTRY=True
NOTREECHECKS=True
TBR=charujain@webrtc.org

Bug: none
Change-Id: I85cc5783ba11774792cd8c2f6c0b4ff47ad89270
Reviewed-on: https://webrtc-review.googlesource.com/1566
Commit-Queue: Henrik Kjellander <kjellander@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19850}

presubmit_test.py

@@ -1,4 +1,13 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python
+
+#  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+#
+#  Use of this source code is governed by a BSD-style license
+#  that can be found in the LICENSE file in the root of the source
+#  tree. An additional intellectual property rights grant can be found
+#  in the file PATENTS.  All contributing project authors may
+#  be found in the AUTHORS file in the root of the source tree.
+
 import unittest
 
 import PRESUBMIT
@@ -37,4 +46,3 @@ class CheckBugEntryField(unittest.TestCase):
 
 if __name__ == '__main__':
   unittest.main()
-

pylintrc

@@ -27,6 +27,7 @@ disable=
   exec-used,
   fixme,
   import-error,
+  invalid-name,
   missing-docstring,
   no-init,
   no-member,