[webapi][XWALK-893] Add 6 Tcs and update 24 Tcs for iap
- Modify the way of using iap
- Failure analysis: The restore method does not suppot
- Block analysis: "In App Purchase" feature does not allowed in China

Impacted tests(approved): new 6, update 24, delete 0
Unit test platform: [Android]
Unit test result summary: pass 6, fail 2, block 22
[wrt] Update 27 TCs due to modify xpk to wgt
Merge pull request #399 from wanghongjuan/wanghongjuan/wrt/wgt

[wrt] Update 8 TCs due to modify xpk to wgt
Merge pull request #378 from yunxliu/yunxliu/webapi/rewrite_iap_Tcs

[webapi][XWALK-893] Add 6 Tcs and update 24 Tcs for iap
[wrt][XWALK-890] update test add create device:/opt/usr/media/tct folder

[Detailed commit message (if have)]
Unit test platform: [tizen]
Unit test result summary: Pass 161 , Fail 0, Blocked 0
Merge pull request #409 from linshen/update-xwalk-890

[wrt][XWALK-890] update test add create device:/opt/usr/media/tct folder