Add RcodeZero Anycast DNS provider

[dklesev]

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[njuettner]

Cool a new provider 🎉. Thank you!

Do you mind rebasing your PR again? Other than that LGTM.

[dklesev]

@njuettner could you look at coveralls, please?

[dklesev]

/assign @iterion

[njuettner]

@dklesev sorry for replying late, I fixed coveralls. The test for types.go is missing, do you mind add them?

[njuettner]

/lgtm
/approve

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This pull-request has been approved by: njuettner

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