[wrt-usecase] Add subapp to suite.json

- The suite can be packaged successfully
- xwalk-2737

Android test result summary: Pass 5, Fail 1, Block 0
[wrt]update manifest script file

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 264, deleted 0
Unit test platform: [tizen]
Test Result: Pass 264, Fail 0
BUILD_ID=tizen-ivi_20141022.3_ivi-mbr-i586
crosswalk-10.38.222.0-19.5.i686
tizen-extensions-crosswalk-0.107-18.2.i686
Merge pull request #1090 from linshen/shenlin/update-wrt-manifest-tizen-tests

[wrt]update manifest script file
Merge pull request #1087 from wanghongjuan/wanghongjuan/usecase/suite

[wrt-usecase] Add subapp to suite.json