### Describe the issue
Warning messages are not displayed when running bitcoin-qt 0.14.2 and 0.14.99 with -disablewallet.
It might be better to always display them.

E.g. on MainNet the "This is a pre-release test build - use at your own risk - do not use for mining or merchant applications" is lost
![image](https://user-images.githubusercontent.com/3296421/29109760-853e5394-7ce4-11e7-8f05-bfcd66ada471.png)
![image](https://user-images.githubusercontent.com/3296421/29109806-adf6e67a-7ce4-11e7-8564-8883c44656ad.png)

On TestNet also the "Warning: unknown new rules activated (versionbit 28)" is missed
![image](https://user-images.githubusercontent.com/3296421/29110269-6b24b79e-7ce6-11e7-91e7-823227eaa200.png)
![image](https://user-images.githubusercontent.com/3296421/29110035-9142cf34-7ce5-11e7-8faf-264e805cdaf4.png)

ui->fontSmallerButton->setIcon(platformStyle->SingleColorIcon(":/icons/fontsmaller"));
    // 
    ui->lineEdit->installEventFilter(this);
    ui->messagesWidget->installEventFilter(this);
    connect(ui->clearButton, &QPushButton::clicked, this, &RPCConsole::clear);
    connect(ui->fontBiggerButton, &QPushButton::clicked, this, &RPCConsole::fontBigger);
    connect(ui->fontSmallerButton, &QPushButton::clicked, this, &RPCConsole::fontSmaller);
    connect(ui->btnClearTrafficGraph, &QPushButton::clicked, ui->trafficGraph, &TrafficGraphWidget::clear);
    // 
    ui->WalletSelector->setVisible(false);
    ui->WalletSelectorLabel->setVisible(false);
    // set library version labels
#ifdef ENABLE_WALLET
    ui->berkeleyDBVersion->setText(DbEnv::version(0, 0, 0));
#else
    ui->label_berkeleyDBVersion->hide();
    ui->berkeleyDBVersion->hide();
#endif
    // 
    rpcTimerInterface = new QtRPCTimerInterface();
    // 
    // 
    m_node.rpcSetTimerInterfaceIfUnset(rpcTimerInterface);
    setTrafficGraphRange(INITIAL_TRAFFIC_GRAPH_MINS);
    ui->detailWidget->hide();
    ui->peerHeading->setText(tr("Select a peer to view detailed information."));
    consoleFontSize = settings.value(fontSizeSettingsKey, QFontInfo(QFont()).pointSize()).toInt();
    clear();
}
RPCConsole::~RPCConsole()