[webapi][XWALK-1330] Add 78 TCs for audiosystem

- Add 78 TCs for audiosystem
- Audiosystem is not supported in Tizen IVI now.

Impacted TCs (designed): New 78, Update 0, Delete 0
Unit test Platform: Tizen IVI
IVI test result summary: Pass 0, Fail 0, Blocked 0
[wrt][XWALK-1541][XWALK-1539]Fix XWALK-1541/1539

Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 14, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 14 , Fail  0, Blocked  0
[misc]Change component from sanity to usecase

Impacted TCs num(approved): New 0, Update , Delete 0
Unit test Platform: [Tizen IVI]
Test result summary: Pass 0, Fail 0, Blocked 0
[wrt] [XWALK-1552] Fix test for xwalk-1522
Merge pull request #366 from wanghongjuan/wanghongjuan/wrt/rtcore

[wrt] [XWALK-1552] Fix test for xwalk-1522

LGTM
Merge pull request #359 from linshen/fix-xwalk-1541-1539

Fix XWALK-1539 XWALK-1541
[webapi][XWALK-990][XWALK-1753]Change 16 TCs stauts to approved

- Fail Reason: The app id is wrong, error callback is invoked.

Impacted TCs num(approved): New 16, Update 0, Delete 0
Unit test Platform: [Tizen-IVI]
Test result summary: Pass 2, Fail 14, Blocked 0
[wrt] Update TCs step for XWALK-1548
Merge pull request #367 from yufeichen/yufeichen/wrt/update-TCs-step-for-XWALK-1548

[wrt] Update TCs step for XWALK-1548
Merge pull request #300 from JianfengXu/xujf/webapi/audiosystem

[webapi][XWALK-1330] Add 78 tests for Audio System API
Merge pull request #365 from JianfengXu/xujf/misc/tizen/xml

[misc]Change component from sanity to usecase
Merge pull request #364 from JianfengXu/xujf/webapi/app

[webapi][XWALK-990]Change 16 TCs stauts to approved