replace / with \ in file names downloaded from fedora
replace / with \ in file names downloaded from fedora

refs #10748

The storage service uses the title found in a fedora mets file to
name the file when it is downloaded from fedora.

This fix removes slashes (/) from filenames and replaces them with \
since unix filenames can't have a / in them.

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