tools/python: convert setup.py to use setuptools if available

Python distutils is deprecated and is going to be removed in Python
3.12. Add support for setuptools.

Setuptools in Python 3.11 complains:

  SetuptoolsDeprecationWarning: setup.py install is deprecated. Use build and pip and other standards-based tools.

Keep using setup.py anyway to build the C extension.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Javi Merino <javi.merino@cloud.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

tools/python/setup.py

@@ -1,5 +1,8 @@
-
-from distutils.core import setup, Extension
+# Prefer setuptools, fall back to distutils
+try:
+    from setuptools import setup, Extension
+except ImportError:
+    from distutils.core import setup, Extension
 import os, sys
 
 XEN_ROOT = "../.."