Send a finished signal after all operation is completed

Send a finished signal after all operation is completed

Since the clean type recovery has been added
If the process of all steps is successful,
the installer considers all of the installation to be successful
and sends a finished signal
If there is an operation in a clean that has not yet been completed
like database commit operation, there is a timing issue that an application
that received the finished signal can access where it is not completed

Change-Id: I3195b46ded497cc67bfc2d12e528d9a9e7961cea
Signed-off-by: Ilho Kim <ilho159.kim@samsung.com>