X go/neo: Fix benchmarkGetObject

- without registering M to tracer it was failing as

  BenchmarkGetObjectNetPipe
      neo_test.go:491: main: expect: *neo.eventMStartReady:
          want: &{m true}
          have: &{ true}
          diff:  {
          - Where: "m",
          + Where: "",
            Ready: true,
           }

- Client is now required to be explicitly Run, but I forgot to update
  thi function in eae3b427.

go/neo/client.go

@@ -194,6 +194,7 @@ func (c *Client) withOperational(ctx context.Context) error {
 	for {
 		c.node.StateMu.RLock()
 		if c.operational {
+			//fmt.Printf("withOperation -> ready\n");
 			return nil
 		}
 
@@ -206,9 +207,6 @@ func (c *Client) withOperational(ctx context.Context) error {
 		case <-ctx.Done():
 			return ctx.Err()
 
-		// XXX case <-c.runctx.Done():
-		//	return "op on closed client ..." ?
-
 		case <-ready:
 			// ok - try to relock and read again.
 		}

go/neo/neo_test.go

@@ -457,6 +457,8 @@ func benchmarkGetObject(b *testing.B, Mnet, Snet, Cnet xnet.Networker, benchit f
 	tG	  := tracetest.NewEventChecker(b, nil /* XXX */, cG)
 
 	tracer    := NewTraceCollector(tdispatch1{cG})
+	tracer.RegisterNode(M.node, "m")
+
 	tracing.Lock()
 	pnode := traceNodeChanged_Attach(nil, tracer.traceNode)
 	traceMasterStartReady_Attach(tracer.pg, tracer.traceMasterStartReady)
@@ -481,12 +483,15 @@ func benchmarkGetObject(b *testing.B, Mnet, Snet, Cnet xnet.Networker, benchit f
 
 	// now after we know Maddr create S & C and start S serving
 	S := tNewStorage("abc1", Maddr, "", Snet, zback)
-	C := NewClient("abc1", Maddr, Cnet)
-
 	wg.Go(func(ctx context.Context) error {
 		return S.Run(ctx)
 	})
 
+	C := NewClient("abc1", Maddr, Cnet)
+	wg.Go(func(ctx context.Context) error {
+		return C.Run(ctx)
+	})
+
 	// command M to start
 	tG.Expect(masterStartReady("m", true))	// <- XXX better with M api
 	tracer.Detach()