Netatmo Binding: log all unconfigured items during startup

To configure the Netatmo Binding you need the device and module addresses. Unfortunately only the device address can be looked up in Netatmo's web interface, the module address needs to be manually calculated (see my post at https://groups.google.com/d/msg/openhab/E0xQLd8lgHw/Z6H5mA3959oJ).

This change logs all items that the user has access to but are not yet configured so that they can be directly added to an items file afterwards.