[sysmon] Add future statements

sysmon is fairly isolated and adding these now does not break anything
or require changes.  Adding these now will prevent violations from
getting added later.

BUG=None
TEST=Run sysmon tests, run sysmon on test machine

Change-Id: I26100ae9ce08a45c6ed084e939cd2d4aa139d28c
Reviewed-on: https://chromium-review.googlesource.com/448999
Commit-Ready: Allen Li <ayatane@chromium.org>
Tested-by: Allen Li <ayatane@chromium.org>
Reviewed-by: David Riley <davidriley@chromium.org>
diff --git a/scripts/sysmon/loop.py b/scripts/sysmon/loop.py
index cfff30b..b472423 100644
--- a/scripts/sysmon/loop.py
+++ b/scripts/sysmon/loop.py
@@ -4,7 +4,9 @@
 
 """Sleep loop."""
 
+from __future__ import absolute_import
 from __future__ import print_function
+from __future__ import unicode_literals
 
 import time