test: fix TestTtlQueue

Changed sleep duration time in test.
The reason is that ttl time is set to 5 seconds in test.
And it doesn't have time for some reason in the case of a test in
the same time.
So set the sleep duration to 10 seconds.

Part of #157

queue/queue_test.go

@@ -687,7 +687,7 @@ func TestTtlQueue(t *testing.T) {
 		}
 	}
 
-	time.Sleep(5 * time.Second)
+	time.Sleep(10 * time.Second)
 
 	//Take
 	task, err = q.TakeTimeout(2 * time.Second)