Question regarding ReconnectionHandler usage from docs.

Are there any possible when getDelay will not be invoked and we should use Thread.sleep inside reconnection handler?

```
ClientManager client = ClientManager.createClient();
ClientManager.ReconnectHandler reconnectHandler = new ClientManager.ReconnectHandler() {

private int counter = 0;

@Override
public boolean onDisconnect(CloseReason closeReason) {
counter++;
if (counter <= 3) {
System.out.println("### Reconnecting... (reconnect count: " + counter + ")");
return true;
} else {
return false;
}
}

@Override
public boolean onConnectFailure(Exception exception) {
counter++;
if (counter <= 3) {
System.out.println("### Reconnecting... (reconnect count: " + counter + ") " + exception.getMessage());

// Thread.sleep(...) or something other "sleep-like" expression can be put here - you might want
// to do it here to avoid potential DDoS when you don't limit number of reconnects.
return true;
} else {
return false;
}
}

@Override
public long getDelay() {
return 1;
}
};

client.getProperties().put(ClientProperties.RECONNECT_HANDLER, reconnectHandler);

client.connectToServer(...)
```