Hooks to migrate from the VMware implementation are available opt-in by
passing the --migrate-from-vmware flag to the manager container. Running
with the migration hooks installed will incur a performance penalty and
should only be used while a migration is active, and then disabled.

Depends on #327

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I'm going to assume the hooks are correct, since I don't know enough about vmware's implementation to know if they're correct or not.

Got one small question, otherwise LGTM.

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