AIP storage works between SSH-only accessible locations
AIP storage works between SSH-only accessible locations

refs #5457

If both source (origin) and destination (current) Locations are only
accessible via SSH, store AIP SSH's into the destination and runs rsync.
Passwordless auth and permissions to read source file and create and
write to the destination path are required for this to work.

artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service