Use keyStream(prefix) in bulk action framework

The way we store contextual information for BAF has changed. Instead of having BULK_ID:status we now have status:BULK_ID (for instance). This makes all command submitted before upgrade not compatible with the Bulk Action Framework after the upgrade. There's no impact on finished command except that status can't be retrieved after the upgrade, but acceptable as it's transient data. There's impact on running command because after upgrading Nuxeo to 10.10, BAF won't be able to retrieve contextual information to finish submitted command before upgrade. As it we advise to upgrade Nuxeo from 10.3 to 10.10 after all BAF processing has finished. Otherwise a manual intervention on the KeyValueStore is possible to reverse these key/value: BULK_ID:status by status:BULK_ID BULK_ID:command by command:BULK_ID