BUTTERFLY_FACTORY: [autotest] power_Resume: stop tlsdated

tlsdated holds a file descriptor to /dev/rtc, which keeps hwclock from working,
so stop tlsdate while running this test.

BUG=chromium-os:35865
TEST=none yet

Signed-off-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/37028
Reviewed-by: Peter Mayo <petermayo@chromium.org>

(cherry picked from commit 72e30a94eb0b7f5f5e8c8dfe78b52b205f418ee2)

Change-Id: I99e1f08c1a9f9be30fe61b6ebbbecbb904f07a30
Reviewed-on: https://gerrit.chromium.org/gerrit/38583
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
diff --git a/client/site_tests/power_Resume/power_Resume.py b/client/site_tests/power_Resume/power_Resume.py
index 23619e4..92447a3 100644
--- a/client/site_tests/power_Resume/power_Resume.py
+++ b/client/site_tests/power_Resume/power_Resume.py
@@ -264,6 +264,7 @@
 
 
     def run_once(self, max_devs_returned=10):
+        utils.system('initctl stop tlsdated')
         # Check hwclock is working
         CheckHwclock()
 
@@ -372,3 +373,4 @@
 
     def cleanup(self):
         self._disable_pm_print_times()
+        utils.system('initctl start tlsdated')