Update DNSSEC trust anchor

[DL6ER]

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What does this PR aim to accomplish?:

Introduce trust anchor that is valid as of 2017-02-02T00:00:00+00:00

Fixes #1846

See also:

A new date for the Key Roll has not yet been determined. ICANN's Office of the Chief Technology Officer says it is tentatively hoping to reschedule the Key Roll for the first quarter of 2018, but that it will be dependent on more fully understanding the new information and mitigating as many potential failures as possible. (https://www.icann.org/news/announcement-2017-09-27-en)

How does this PR accomplish the above?:

Ass the new anchor taken from the official source http://data.iana.org/root-anchors/root-anchors.xml