[webapi][XWALK-1330]create 63 tests for Audio System and change test status to approved

- Fail Reason: run connect method, the error callback is invoked.

Impacted TCs num(approved): New 73, Update 0, Delete 0
Unit test Platform: [Tizen IVI]
Test result summary: Pass 4, Fail 69, Blocked 0
Merge pull request #394 from JianfengXu/xujf/audiosystem/add

[webapi][XWALK-1330]create 63 tests for Audio System and change test status to approved