MDL-46455 tool_log: added function to return stores that support logging
MDL-46455 core_backup: use log stores to perform the backup
MDL-46455 logstore_*: added backup support
MDL-46455 core_backup: use log stores to perform the restore
MDL-46455 logstore_*: added restore support
use log stores to backup blah
use log stores to restore blah