autotest: set check_client_result in power_RPMTest

This makes the autotest code check the result of power_CheckAC when
it's run from power_RPMTest. This will cause an exception to occur if
the power_CheckAC test fails.

BUG=None
TEST=power_RPMTest

Change-Id: If74b0f7bc53c7958f42a5104716fbb2e9b50356c
Reviewed-on: https://chromium-review.googlesource.com/495630
Commit-Ready: Hsinyu Chao <hychao@chromium.org>
Tested-by: Derek Basehore <dbasehore@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
diff --git a/server/site_tests/power_RPMTest/power_RPMTest.py b/server/site_tests/power_RPMTest/power_RPMTest.py
index 2cc58f4..9884a78 100755
--- a/server/site_tests/power_RPMTest/power_RPMTest.py
+++ b/server/site_tests/power_RPMTest/power_RPMTest.py
@@ -29,8 +29,8 @@
             self._host.power_off()
 
         if self._verify:
-            if not self._host_at.run_test('power_CheckAC', power_on=power_on):
-                raise error.TestError('power_CheckAC failed')
+            self._host_at.run_test('power_CheckAC', check_client_result=True,
+                                   power_on=power_on):
 
 
     def run_once(self, power_sequence=[True]):