pf: cope with route-to on af-to rules

af-to uses pf_route() and pf_route6(), which caused issues when af-to and
route-to were combined in a single rule.
Extend the relevant functions to cope with th

pf: cope with route-to on af-to rules

af-to uses pf_route() and pf_route6(), which caused issues when af-to and
route-to were combined in a single rule.
Extend the relevant functions to cope with this and add test cases.

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