sysmon: Fix unicode_literals

Adopt Google style recommendations for not using the future import and
explicitly declaring unicode strings.

BUG=None
TEST=None

Change-Id: Ifecab137f2b501e71b680b3ff7e786045dd4e2b5
Reviewed-on: https://chromium-review.googlesource.com/514453
Commit-Ready: Allen Li <ayatane@chromium.org>
Tested-by: Allen Li <ayatane@chromium.org>
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
diff --git a/scripts/sysmon/puppet_metrics.py b/scripts/sysmon/puppet_metrics.py
index ba7a7ac..8bffb3d 100644
--- a/scripts/sysmon/puppet_metrics.py
+++ b/scripts/sysmon/puppet_metrics.py
@@ -6,7 +6,6 @@
 
 from __future__ import absolute_import
 from __future__ import print_function
-from __future__ import unicode_literals
 
 import time
 
@@ -93,7 +92,7 @@
   try:
     summary = _PuppetRunSummary(LAST_RUN_FILE)
   except Exception as e:
-    logger.warning('Error loading Puppet run summary: %s', e)
+    logger.warning(u'Error loading Puppet run summary: %s', e)
   else:
     _config_version_metric.set(summary.config_version)
     _puppet_version_metric.set(str(summary.puppet_version))