[webapi] Add 9 p2 case for audiosystem

Impacted TCs num(approved): New 9, Update 0, Delete 0
Unit test Platform: [Tizen-IVI]
Unit test result summary: Pass 9, Fail 0, Blocked 0
Merge pull request #1572 from JianfengXu/audiosystem/p2

[webapi] Add 9 p2 case for audiosystem