Add "nextosid" slot to os_info table, for chaining from a generic OSID
to a specific one, for the purposes of mapping things like FBSD-STD to FBSD47-STD (the current OSID to use). This is technically more correct than what os_setup used to do, which was map FBSD-STD to whatever FreeBSD OSID was currently on the disk. Now it maps to a specific one, and if that is not loaded, it sets up a reload.
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