[Tizen][Runtime] Sort out the logic of app id.

The patch of app id I made some days ago make the logic of app
id become too complex, so I sort out the logic of app id:
For xpk, [app_id] = GenerateId or GenerateIdForPath,
         [tizen_app_id] = xwalk.[app_id]
For wgt, [app_id] = GenerateId([tizen_app_id])
         [tizen_app_id] = Get from config.xml

Beside since we start get app info from ail, we can only get app
data from storage with [tizen_app_id].