[wrt] Update TCs for XWALK-1792

Impacted TC num(approved): New 0, Update 3, Delete 0
Unit test platform:  tizen ivi
Unit test result summary: Pass 1, Fail 2, Block 0
Fail reason: root user is default on ivi group 'root' not allowed, so use "sdb shell xwalkctl --install xxx.xpk" can't install app,