netinet6 tests: Add a regression test for default router handling

This serves as a regression test for commit a48df53e4249.

Reviewed by: bz, allanjude
MFC after: 2 weeks
Sponsored by: Klara, Inc.
S

netinet6 tests: Add a regression test for default router handling

This serves as a regression test for commit a48df53e4249.

Reviewed by: bz, allanjude
MFC after: 2 weeks
Sponsored by: Klara, Inc.
Sponsored by: Bell Tower Integration
Differential Revision: https://reviews.freebsd.org/D46136

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