Create a new directory for non-user-facing scripts

Create a directory for scripts that are useful to maintainers, and may be
invoked as part of the CI, but are not part of the normal build.

These scripts may require a recent Python version and may require additional
third-party modules, unlike user-facing scripts where we try to minimize
requirements.

Signed-off-by: Gilles Peskine <[email protected]>

util/requirements.txt

@@ -0,0 +1 @@
+# Python module requirements for maintainer utilities

util/scripts_path.py

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+"""Add our Python library directory to the module search path.
+
+Usage:
+
+    import scripts_path # pylint: disable=unused-import
+    from mbedtls_framework import ...
+"""
+
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+#
+
+import os
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__),
+                             os.path.pardir,
+                             'scripts'))