[Alarm] Fix failures raised from test suite.
I've downloaded the test suite from http://otcqa.sh.intel.com/qa-auto/live/Web_TCT_Xwalk/ and run them manually.
All the alarm related failures in the test suite have been fixed.

BUG=XWALK-2163
Merge pull request #358 from yejingfu/topic-alarm

[Alarm] Fix failures raised from test suite.