Create rocksdb_datadir if not exist

[sunshine-Chun]

Summary: When rebuilding a db, mysqld fails because it can not find rocksdb_datadir in move_wals_to_target_dir(). rocksdb_datadir has not been created at the time, but move_wals_to_target_dir() assumes it has.

Add a check about rocksdb_datadir, if it doesn't exist, create the path.

The reason why we never hit this before is, when we test the clone, the db has already been built and the rocksdb_datadir has been created.

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