Replace K8s namespace with IP

hostToIP.go

//
// Looks up a host using the resolver and returns an IP.
// Utility function for testing against K8s over VPN.
// Resolver should be the POD ip of kube-dns
//
func hostToIP(host string, resolver string) string {
	fmt.Printf("Looking up %s using resolver %s\n", host, resolver)
	r := &net.Resolver{
		PreferGo: true,
		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
			d := net.Dialer{
				Timeout: time.Millisecond * time.Duration(10000),
			}
			resolverFull := fmt.Sprintf("%s:53", resolver)
			return d.DialContext(ctx, network, resolverFull)
		},
	}
	ip, _ := r.LookupHost(context.Background(), host)
	return ip[0]
}