Upgrade after crosswalk always use tizen_app_id on tizen.

See https://github.com/crosswalk-project/crosswalk/pull/2261

After the PR of crosswalk, we always get the app_id which will
equal to the app_id storaged in pkgmgr DB, so there is no need
to convert pkg_id to app_id.

And the object path of running application on dbus was changed
so we need to change it too.

BUG=XWALK-1925
Can I know where change of the  runtime running object path? And I still do not get why need not save app_id with `.` instead of `_`.