cygprofile: switch scripts to use vpython

This should avoid import problems from various catapult dependencies
that are pulled via src/.vpython. One such problem was recently
mentioned in http://crrev.com/546790.

Also for consistency:
1. make all unittests executable
2. remove shebang and exec bit for the scripts that never produce output
   (utilities)

To read more about vpython:
  https://chromium.googlesource.com/infra/infra/+/master/doc/users/vpython_one_page.md

Change-Id: I167a13f03b1f4a0c95d57557055840fa35db7f41
Reviewed-on: https://chromium-review.googlesource.com/986264
Reviewed-by: Benoit L <[email protected]>
Commit-Queue: Egor Pasko <[email protected]>
Cr-Commit-Position: refs/heads/master@{#546845}
diff --git a/tools/cygprofile/check_orderfile_unittest.py b/tools/cygprofile/check_orderfile_unittest.py
index 644b9c33..8205bc5 100755
--- a/tools/cygprofile/check_orderfile_unittest.py
+++ b/tools/cygprofile/check_orderfile_unittest.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env vpython
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.