[wrt][XWALK-1834]Add 2 Tcs for wrt-packagemgt-tizen-tests

Impacted TCs num(approved): New 2, update 0, deleted  0
Unit test platform: [tizen]
Unit test result summary: Pass 2   , Fail 0,Block 0
Merge pull request #305 from linshen/add-xwalk-1834-tcs

[wrt][XWALK-1834] Add 2 Tcs for wrt-packagemgt-tizen-tests