[TIZEN] Set app ID and media class properties for the audio streams.

Set an application ID and media class properties for the audio streams in
pulseaudio and Murhy, so that the Murphy resource policy daemon can dictate
when the audio will be paused and resumed in response to other audio playing.

BUG=XWALK-2788
Merge pull request #205 from nagineni/media_role

[TIZEN] Set app ID and media class properties for the audio streams.