[medium] don't conditionally run killDupAgents routine

We need to make sure we are actively draining the DetectDupAgents
channel, otherwise routines writing here will end up blocking. We
check the ctx.Agent.KillDupAgents setting inside killDupAgents, so just
send the queue location here and it will be handled according to the
configuration value.

mig-scheduler/routines.go

@@ -267,18 +267,16 @@ func startRoutines(ctx Context) {
 	ctx.Channels.Log <- mig.Log{Desc: "queue cleanup routine started"}
 
 	// launch the routine that handles multi agents on same queue
-	if ctx.Agent.KillDupAgents {
-		go func() {
-			for queueLoc := range ctx.Channels.DetectDupAgents {
-				ctx.OpID = mig.GenID()
-				err = killDupAgents(queueLoc, ctx)
-				if err != nil {
-					ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("%v", err)}.Err()
-				}
+	go func() {
+		for queueLoc := range ctx.Channels.DetectDupAgents {
+			ctx.OpID = mig.GenID()
+			err = killDupAgents(queueLoc, ctx)
+			if err != nil {
+				ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("%v", err)}.Err()
 			}
-		}()
-		ctx.Channels.Log <- mig.Log{Desc: "killDupAgents() routine started"}
-	}
+		}
+	}()
+	ctx.Channels.Log <- mig.Log{Desc: "killDupAgents() routine started"}
 
 	// launch the routine that heartbeats the relays and terminates if connection is lost
 	go func() {