Update nat discovery to support IP family #5261

Job	Run time
No "Apply suggestions from code review" Commits	3s
Check branch dependencies	29s
Submariner K8s API Code Generation	1m 23s
Commit Message(s)	16s
Dependency Licenses	2m 40s
Go	4m 16s
Markdown Links (modified files)	15s
Markdown	8s
Package Documentation	55s
Protobuf Code Generation	39s
Shell	13s
Variant Analysis	4m 22s
Vulnerability Scanning	27s
YAML	10s
	16m 16s

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