[Dataset] Change finalize signature

[Dataset] Change finalize signature

This patch changes finalize signature to contain user_data,
user_data will be needed to replicate the current worker(with diffrent
arguments) in case of
MT_safty is not provided by the producer. Please note that this does not
change any current behavior but the preparation for the future
enhancements.

**Self evaluation:**
1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test: [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Jihoon Lee <jhoon.it.lee@samsung.com>