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/buildbucket.py b/buildbucket.py
index bbb8997..d5b87e9 100755
--- a/buildbucket.py
+++ b/buildbucket.py
@@ -15,6 +15,8 @@
   Puts a build into buildbucket for my-builder on tryserver.chromium.linux.
 """
 
+from __future__ import print_function
+
 import argparse
 import json
 import urlparse
@@ -153,9 +155,9 @@
   http.force_exception_to_status_code = True
 
   if args.verbose:
-    print 'Request URL:', url
-    print 'Request method:', method
-    print 'Request body:', body
+    print('Request URL:', url)
+    print('Request method:', method)
+    print('Request body:', body)
 
   response, content = http.request(
     url,
@@ -165,8 +167,8 @@
   )
 
   if args.verbose:
-    print 'Response:', response
-    print 'Content:', content
+    print('Response:', response)
+    print('Content:', content)
 
   try:
     content_json = json.loads(content)
@@ -177,7 +179,7 @@
   except (ValueError, TypeError, KeyError):
     pass
   else:
-    print 'Build: %s' % build_url
+    print('Build: %s' % build_url)
 
   return response.status != 200