Add a bed for the signed-login bus over a real network (research 053 question 8)

test/bed-programs/signed-logins/main.go

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+// Command q8lab is the program behind test/integration/signed-logins.test.ts (research 053, question 8).
+//
+//	q8lab gen    -out DIR -a IP -b IP -c IP   writes keys and the three servers' configs (runs on the workstation)
+//	q8lab server -conf FILE                  runs one nats-server 2.11.17 (embedded) until killed
+//	q8lab agent  -peer IP                    on machine C: an HTTP switch that cuts and restores traffic to the peer
+//	q8lab wait   -url URL                    waits until the URL answers 200
+//	q8lab drive  -keys FILE                  on machine A: runs the measurements and prints them
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("usage: q8lab gen|server|agent|wait|drive")
+		os.Exit(2)
+	}
+	args := os.Args[2:]
+	switch os.Args[1] {
+	case "gen":
+		gen(args)
+	case "server":
+		runServer(args)
+	case "agent":
+		runAgent(args)
+	case "wait":
+		runWait(args)
+	case "drive":
+		drive(args)
+	default:
+		fmt.Println("unknown command", os.Args[1])
+		os.Exit(2)
+	}
+}