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/cros/init_unittest.py b/cros/init_unittest.py
index 8c8271b..11bfe4e 100755
--- a/cros/init_unittest.py
+++ b/cros/init_unittest.py
@@ -5,6 +5,8 @@
 
 """This module tests the command module."""
 
+from __future__ import print_function
+
 import argparse
 import os
 import sys
@@ -21,7 +23,7 @@
 class TestCommand(cros.CrosCommand):
   """A fake command."""
   def Run(self):
-    print 'Just testing'
+    print('Just testing')
 
 
 # pylint: disable=W0212