QmlDebugger: Fix Remote QML Debugging

The host address is now retreived from the kit info.
Incase, a device is not associated with the given kit,
the host is assumed to be localhost.

Change-Id: I659d2d64ec78dc1b10c80c97390994a56ff26344
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>