History database returns the list of (blockNum,tranNum) that
updated a key.
RetrieveTxByBlockNumTranNum will allow kvledger
to retrieve transaction history for this list of key updates.

Change-Id: I9ff3ed6c273c57b65223b283c4f602910e5982bf
Signed-off-by: denyeart <enyeart@us.ibm.com>