Comment 10 for bug 1433240

I've added a patch in - I think the default should be on_metal, and we can address moves from juno-> kilo/master individually/in an unassociated upgrade script (in my opinion).

I also wanted to move scheduler service into its own container because I don't believe it should ever have lived on the "volumes" container to begin with. The new default will be for it to go on the storage_infra hosts. (assuming my pr is merged)