contrib/lutok: update from 0.4 to 0.6.2

More information about what's included in the new release can be found
[here](https://github.com/freebsd/lutok/compare/lutok-0.4...lutok-0.6.2).

MFC after: 1

contrib/lutok: update from 0.4 to 0.6.2

More information about what's included in the new release can be found
[here](https://github.com/freebsd/lutok/compare/lutok-0.4...lutok-0.6.2).

MFC after: 1 week
Merge commit '447d4fe61d8bf55ffa21698ecee0ac51010a9a0f'

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