convert to print_function

BUG=chromium:414895
TEST=`./cbuildbot/run_tests` passes
TEST=`cros lint` passes (it complains if print is used incorrectly)
TEST=`cbuildbot chromiumos-sdk` passes
TEST=`cbuildbot lumpy-release` passes

Change-Id: I67e7e1290b03a16525e0c2b1afa74ebbd8d3508f
Reviewed-on: https://chromium-review.googlesource.com/218572
Reviewed-by: David James <davidjames@chromium.org>
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/autotest_quickmerge.py b/scripts/autotest_quickmerge.py
index 1de0864..80bce3c 100644
--- a/scripts/autotest_quickmerge.py
+++ b/scripts/autotest_quickmerge.py
@@ -8,6 +8,8 @@
 emerge-$board autotest-all, by simply rsync'ing changes from trunk to sysroot.
 """
 
+from __future__ import print_function
+
 import argparse
 import glob
 import logging
@@ -367,7 +369,7 @@
     return 0
 
   if not args.board:
-    print 'No board specified. Aborting.'
+    print('No board specified. Aborting.')
     return 1
 
   manifest = git.ManifestCheckout.Cached(constants.SOURCE_ROOT)