### 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)

// 
        connect(model->getPeerTableModel(), &PeerTableModel::layoutChanged, this, &RPCConsole::peerLayoutChanged);
        // 
        connect(model->getPeerTableModel(), &PeerTableModel::layoutAboutToBeChanged, this, &RPCConsole::peerLayoutAboutToChange);
        // 
        ui->banlistWidget->setModel(model->getBanTableModel());
        ui->banlistWidget->verticalHeader()->hide();
        ui->banlistWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
        ui->banlistWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
        ui->banlistWidget->setSelectionMode(QAbstractItemView::SingleSelection);
        ui->banlistWidget->setContextMenuPolicy(Qt::CustomContextMenu);
        ui->banlistWidget->setColumnWidth(BanTableModel::Address, BANSUBNET_COLUMN_WIDTH);
        ui->banlistWidget->setColumnWidth(BanTableModel::Bantime, BANTIME_COLUMN_WIDTH);
        ui->banlistWidget->horizontalHeader()->setStretchLastSection(true);
        // 
        QAction* unbanAction = new QAction(tr("&Unban"), this);
        // 
        banTableContextMenu = new QMenu(this);
        banTableContextMenu->addAction(unbanAction);
        // 
        connect(ui->banlistWidget, &QTableView::customContextMenuRequested, this, &RPCConsole::showBanTableContextMenu);
        connect(unbanAction, &QAction::triggered, this, &RPCConsole::unbanSelectedNode);
        // 
        connect(ui->banlistWidget, &QTableView::clicked, this, &RPCConsole::clearSelectedNode);
        // 
        connect(model->getBanTableModel(), &BanTableModel::layoutChanged, this, &RPCConsole::showOrHideBanTableIfRequired);
        showOrHideBanTableIfRequired();
        // 
        ui->clientVersion->setText(model->formatFullVersion());
        ui->clientUserAgent->setText(model->formatSubVersion());