[wrt]update tcs for tct-pm-wrt-tests

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 2, deleted  0
Unit test platform: [tizen]
Unit test result summary: Pass 1, Fail 1, Blocked 0
Fail: wrt_pm_dataStored_Update.sh  WGT can not update.
BUGID:https://crosswalk-project.org/jira/browse/XWALK-2249
Merge pull request #799 from linshen/wrt/wrt-pm

[wrt]update tcs for tct-pm-wrt-tests