File movements

In order to rework some of the persistence layer I would
like to move around some of the files first, keeping job
specifics in a jobs folder. Having some of the items which
are root level taskflow items (flow, task) be at the root
of the hiearchy. Also for now until the celery work is
commited move that, since it doesn't make sense in backends
anyway.

Change-Id: If6c149710b40f70d4ec69ee8e523defe8f5e766d