[9.18] A couple of RPZ options were not reconfigured as expected

Tony Finch requested to merge 3740-rpz-reconfig-v9_18 into v9_18

[bug] Changes to the RPZ response-policy min-update-interval and add-soa options now take effect as expected when named is reconfigured. [GL #3740 (closed)]

Backport of !7230 (merged)

Closes #3740 (closed)

Edited by Michał Kępień

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