ECBackend: For ec read/recovery only there is push-reply, it
 queue transaction.

For ec read(pg not degraded), we found some write on journal. In func
dispatch_recovery_messages, for MSG_OSD_EC_READ_REPLY it queue
transaction and later cause update journal. But for normal ec read, it's no need to
queue transaction.
Actually, only for PGPUSH, it need queue transaction.