CLI Option --cleanup-config Is Not Working Correctly

[aauren]

What happened?
@vladimirtiukhtin reported the following here: #1617 (comment)

Unrelated to the subj, but might be worth to look at

# kube-router --cleanup-config
I0419 08:38:35.287507  288326 network_policy_controller.go:713] Cleaning up NetworkPolicyController configurations...
I0419 08:38:35.287552  288326 network_policy_controller.go:746] Successfully cleaned the NetworkPolicyController configurations done by kube-router
I0419 08:38:35.287575  288326 network_services_controller.go:1755] Cleaning up NetworkServiceController configurations...
I0419 08:38:35.289694  288326 network_services_controller.go:1762] ipvs definitions don't have names associated with them for checking, during cleanup we assume that we own all of them and delete all ipvs definitions
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x98 pc=0x180e7d2]

goroutine 1 [running]:
github.com/cloudnativelabs/kube-router/v2/pkg/controllers/proxy.(*NetworkServicesController).deleteHairpinIptablesRules(0xc000628010?, {0x2262d11?, 0x0?})
	/home/runner/work/kube-router/kube-router/pkg/controllers/proxy/network_services_controller.go:1436 +0x52
github.com/cloudnativelabs/kube-router/v2/pkg/controllers/proxy.(*NetworkServicesController).Cleanup(0xc00061f8b0?)
	/home/runner/work/kube-router/kube-router/pkg/controllers/proxy/network_services_controller.go:1779 +0x32b
github.com/cloudnativelabs/kube-router/v2/pkg/cmd.CleanupConfigAndExit()
	/home/runner/work/kube-router/kube-router/pkg/cmd/kube-router.go:71 +0x85
main.Main()
	/home/runner/work/kube-router/kube-router/cmd/kube-router/kube-router.go:65 +0x406
main.main()
	/home/runner/work/kube-router/kube-router/cmd/kube-router/kube-router.go:21 +0x13