### 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)

platformStyle->SingleColorImage(ICON_MAPPING[i].source).scaled(QSize(consoleFontSize*2, consoleFontSize*2), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
    }
    // 
    QFontInfo fixedFontInfo(GUIUtil::fixedPitchFont());
    ui->messagesWidget->document()->setDefaultStyleSheet(
        QString(
                "table { }"
                "td.time { color: #808080; font-size: %2; padding-top: 3px; } "
                "td.message { font-family: %1; font-size: %2; white-space:pre-wrap; } "
                "td.cmd-request { color: #006060; } "
                "td.cmd-error { color: red; } "
                ".secwarning { color: red; }"
                "b { color: #006060; } "
            ).arg(fixedFontInfo.family(), QString("%1pt").arg(consoleFontSize))
        );
#ifdef Q_OS_MAC
    QString clsKey = "(⌘)-L";
#else
    QString clsKey = "Ctrl-L";
#endif
    message(CMD_REPLY, (tr("Welcome to the %1 RPC console.").arg(tr(PACKAGE_NAME)) + "<br>" +
                        tr("Use up and down arrows to navigate history, and %1 to clear screen.").arg("<b>"+clsKey+"</b>") + "<br>" +
                        tr("Type %1 for an overview of available commands.").arg("<b>help</b>") + "<br>" +
                        tr("For more information on using this console type %1.").arg("<b>help-console</b>") +
                        "<br><span class=\"secwarning\"><br>" +
                        tr("WARNING: Scammers have been active, telling users to type commands here, stealing their wallet contents. Do not use this console without fully understanding the ramifications of a command.") +
                        "</span>"),
                        true);
}
void RPCConsole::keyPressEvent(QKeyEvent *event)