Have file service take over publishing file data (without maestro!)

[rosibaj]

Have file service take over publishing file data (without maestro!) [1 sprint]
--- Index must include RELEASE_STAGE file.
--- When we have fs take over, we will replace the public index (exact same as now)
--- Publish the same current index, with file-service, but now has the release_stage in index. complete backup of this index as well.
------- At a program level, PUBLIC will go to PUBLIC index, [OWNPROGRAM,FULL,ASSOCIATE] goes to an EMBARGO index
--- implement the update to the index strategy [Public + Private indices set in one alias per program]

2.1 File service needs to be able to responds to Song publish, unpublish, and suppress.