As the transientstore is moved out of ledger and committer fetches
private write set from transient store and pass it to ledger for
commit, ledger no longer use transient store directly to fetch private
write set. Hence, transientstore usage in ledger is cleaned up in this
CR.

Change-Id: Ic55940abab32ab7e25c9d3f7d899183ed599ab7b
Signed-off-by: senthil <cendhu@gmail.com>