Convert print statements to Python 3 style

Ran "2to3 -w -n -f print ./" and manually added imports.
Ran "^\s*print " and "\s+print " to find batch/shell scripts, comments and the like with embedded code, and updated them manually.
Also manually added imports to files, which used print as a function, but were missing the import.

The scripts still work with Python 2.
There are no intended behaviour changes.

Bug: 942522
Change-Id: Id777e4d4df4adcdfdab1b18bde89f235ef491b9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1595684
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Auto-Submit: Raul Tambre <raul@tambre.ee>
diff --git a/fix_encoding.py b/fix_encoding.py
index faa7c7c..c8f64ff 100644
--- a/fix_encoding.py
+++ b/fix_encoding.py
@@ -6,6 +6,8 @@
 multiple platforms with python.
 """
 
+from __future__ import print_function
+
 import codecs
 import locale
 import os
@@ -22,8 +24,9 @@
   to our wrapper. So be paranoid about catching errors and reporting them
   to sys.__stderr__, so that the user has a higher chance to see them.
   """
-  print >> sys.__stderr__, (
-      isinstance(message, str) and message or repr(message))
+  print(
+      isinstance(message, str) and message or repr(message),
+      file=sys.__stderr__)
 
 
 def fix_default_encoding():