nmstate: use force regeneration of vethsetup
If fails occur we may end in unknown state, let's destroy completely our test setup and recreate it. This should avoid any inconsistencies that may occur.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
If fails occur we may end in unknown state, let's destroy completely our test setup and recreate it. This should avoid any inconsistencies that may occur.