Before we commit the pvtData of old blocks to the stateDB,
we must update the BTL bookkeeping accordingly by creating
appropriate expiryEntries.

FAB-12888 #done

Change-Id: Id16b69e5a2e0d59c2497ddad7fda3d82ed23e0a5
Signed-off-by: senthil <cendhu@gmail.com>
Signed-off-by: manish <manish.sethi@gmail.com>