run-tests: deal with distutil deprecation

PEP 632 recommend the use of `packaging.version` to replace the deprecated
`distutil.version`. So lets do it.

tests/run-tests.py

@@ -48,7 +48,7 b' import argparse'
 import collections
 import contextlib
 import difflib
-import distutils.version as version
+
 import errno
 import functools
 import json
@@ -72,6 +72,13 b' import unittest'
 import uuid
 import xml.dom.minidom as minidom
 
+try:
+    # PEP 632 recommend the use of `packaging.version` to replace the
+    # deprecated `distutil.version`. So lets do it.
+    import packaging.version as version
+except ImportError:
+    import distutils.version as version
+
 if sys.version_info < (3, 5, 0):
     print(
         '%s is only supported on Python 3.5+, not %s'