Add removing of RocksDB ledger temporary dir on migration fail.
Add removing of RocksDB ledger temporary dir on migration fail.

Signed-off-by: Sergey Shilov <064bbdfaeb89a0bebebfe7b388747a73c8941704@dsr-company.com>

spivachuk/sovrin-node,spivachuk/sovrin-node,spivachuk/sovrin-node,spivachuk/sovrin-node