This took a while because I had other distractions and I spent some
time studying how all this vmstate code works, and that itself got
to be a distraction.

I'm not 100% sure what I have done is right.  Maybe there is a way to
do a backwards migration for KCS, but I'm not sure how.

Changes from v1:
  * Validate the data values in a pre_load functions.
  * For KCS, instead of an old function, create a separate vmstate
    structure for the new version.  The name on the old vmstate
    structure wasn't specific enough, so a new name was needed,
    The old structure is set up to never be sent, but it can be

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