[misc] update/add tcs for  web-mbat-tests

[Detailed commit message (if have)]
Impacted TCs num(approved): New 1, update 8, deleted 7
Unit test platform: [tizen]
Unit test result summary: Pass 8 , Fail 1, Blocked 0
Crosswalk_WebApp_Update fail: wgt can not update.
BUGID:https://crosswalk-project.org/jira/browse/XWALK-2296