python: Force file system encoding on cmdline args

On Windows, the default file system encoding is 'mbcs'
resulting in a bad conversion.

To make it cross-platform tolerant use
'sys.getfilesystemencoding()' instead of 'utf-8'.

Co-authored-by: Alin Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Alin Balutoiu <abalutoiu@cloudbasesolutions.com>
Signed-off-by: Alin Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: Russell Bryant <russell@ovn.org>

tests/test-ovsdb.py

@@ -336,7 +336,8 @@ def notify(event, row, updates=None):
                 if six.PY2:
                     s.s = args[2].decode('utf-8')
                 else:
-                    s.s = args[2].encode('utf-8', 'surrogateescape') \
+                    s.s = args[2].encode(sys.getfilesystemencoding(),
+                                         'surrogateescape') \
                                  .decode('utf-8', 'replace')
             elif args[1] == "u":
                 s.u = uuid.UUID(args[2])