### 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)

{
    QModelIndex index = ui->peerWidget->indexAt(point);
    if (index.isValid())
        peersTableContextMenu->exec(QCursor::pos());
}
void RPCConsole::showBanTableContextMenu(const QPoint& point)
{
    QModelIndex index = ui->banlistWidget->indexAt(point);
    if (index.isValid())
        banTableContextMenu->exec(QCursor::pos());
}
void RPCConsole::disconnectSelectedNode()
{
    // G
    QList<QModelIndex> nodes = GUIUtil::getEntryData(ui->peerWidget, PeerTableModel::NetNodeId);
    for(int i = 0; i < nodes.count(); i++)
    {
        // G
        NodeId id = nodes.at(i).data().toLongLong();
        // F
        if(m_node.disconnect(id))
            clearSelectedNode();
    }
}
void RPCConsole::banSelectedNode(int bantime)