fix: Sort values neigh_most_frequent so tie-break chooses lowest
fix: Sort values neigh_most_frequent so tie-break chooses lowest

Addresses issue with stability in IP addressing: inter-asn links had a
collision domain that was arbitrarily being allocated to one or the
other ASN depending on the arbitarty position. This ensures the lowest
is always returned in a tie-break leading to repeatable addressing
(especially important for automated tests)

sk2/autonetkit