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jaques smith <jaques@opencollab.co.za> in Sakai.Git

KNL-1268 - Extract content file operations to support multiple backends

Thanks to OpenCollab ZA for the patch.

This makes way for filesystems other than local (or mapped) disk, such

as OpenStack Swift.

A new interface is added, FileSystemHandler, along with extracting the

default file implementation. I made a few fixes to update the patch and

clean up a few stylistic things to fit into the kernel code better, but

there are no name or design changes.