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
This changed after https://github.com/crosswalk-project/crosswalk/pull/2261
And object path with '.' is an invalid object path(see https://code.google.com/p/chromium/codesearch#chromium/src/dbus/string_util.cc&sq=package:chromium&type=cs&l=11&rcl=1406811557)