QtIFW

Remove occurrences of QHostAddress.

The overload of QAbstractSocket::connectToHost() did convert to
QHostAddress back to QString to call the other connect version.

Change-Id: Idd4089fd92cfd9b103786395a455d0a18abc2c4a
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>