Add test that fails when oadm migrate is required

[enj]

• Add a test that directly writes old versions of objects to etcd. When we remove support for a type, reading that type from etcd will fail and remind us that an oadm migrate step is required for that release.

We should not need this for a while.

cc @liggitt @smarterclayton do we need anything else?

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/lifecycle stale

[enj]

/unassign

@stlaz @sttts @mfojtik