FreeBSD/src cdac716 (r351391)tests/sys/netpfil/pf icmp.sh forward.sh

Fix path issues after r351212

This fixes sys.netpfil.pf.forward.v4 and sys.netpfil.pf.icmp.cve_2019_5598
failures in CI system.

Sponsored by:   The FreeBSD Foundation
DeltaFile
+4-1tests/sys/netpfil/pf/icmp.sh
+1-1tests/sys/netpfil/pf/forward.sh
+5-22 files

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