Change the processing slot for cleardata/clearcache

Change the processing slot for cleardata/clearcache

In the most client's event-callback, the pkgid is used to classify the incomming event.
So, we should control not to process somethings simultaneously
for same pkgid in different slots.

Note: In case of getting size, there is dedicated callback. so, no problem.
In case of clear cache all, the pkgid is '__ALL__', so it can be distinguished.

Change-Id: If7840f9ae49ae5857483cae3ed3902f0cdab0319
Signed-off-by: jongmyeongko <jongmyeong.ko@samsung.com>
(cherry picked from commit a171770669d15b8f1d0ab44aa5c438ba83e5880c)