[v9_18] Add some dnssec-policy configuration checks

Matthijs Mekking requested to merge 1611-detect-insane-dnssec-policies-v9_18 into v9_18

If a dnssec-policy has multiple keys configured with the same algorithm and role.

(cherry picked from commit f54dad00)

Closes #1601 (closed), #1611 (closed)

Edited by Michał Kępień

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