test: prepare test/pseudo-tty/testcfg.py Python 3

PR-URL: https://github.com/nodejs/node/pull/24887
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

test/pseudo-tty/testcfg.py

@@ -1,4 +1,3 @@
-from __future__ import print_function
 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
@@ -26,12 +25,19 @@ from __future__ import print_function
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+from __future__ import print_function
+
 import test
 import os
 from os.path import join, exists, basename, isdir
 import re
 import utils
 
+try:
+  reduce           # Python 2
+except NameError:  # Python 3
+  from functools import reduce
+
 try:
   xrange          # Python 2
 except NameError: