dkg: fixing TestSyncFlow (#3410)

Another attempt to fix TestSyncFlow flakey test.

category: fixbuild
ticket: none

dkg/dkg_test.go

@@ -580,7 +580,7 @@ func (c *connTracker) AwaitN(t *testing.T, dkgErrChan chan error, n int, peerIdx
 	ticker := time.NewTicker(time.Millisecond * 100)
 	defer ticker.Stop()
 
-	timeout := time.NewTimer(time.Second * 5)
+	timeout := time.NewTimer(time.Second * 10)
 	defer timeout.Stop()
 
 	for {
@@ -655,8 +655,12 @@ func startNewDKG(t *testing.T, parentCtx context.Context, config dkg.Config, dkg
 	ctx, cancel := context.WithCancel(parentCtx)
 
 	go func() {
+		jitter := time.Duration(rand.Intn(300)) * time.Millisecond
+		time.Sleep(jitter)
+
 		err := dkg.Run(ctx, config)
 		log.Info(ctx, "DKG process returned", z.Any("error", err))
+
 		select {
 		case <-parentCtx.Done():
 		case dkgErrChan <- err: