Restart wifi instead of reboot whole system about thingos

[ccrisan]

@avanc while I'm not saying that the choice of rebooting upon network loss is the best choice, here are some reasons that led to it:

• thingOS was designed with network connectivity in mind, meaning that losing upstream connection is considered fatal issue (i.e. the system can't work properly without it)
• connectivity losses may be caused by faulty drivers or hardware issues that could only be recovered from (if at all) by a reboot
• services running on thingOS might not be designed well enough to be resilient to network reconnections; rebooting the OS will effectively restart them
• the OS itself is supposed to behave like an "embedded" system, where anything that goes wrong would trigger a reset
• the OS is supposed to boot fast enough so that the downtime caused by the reboot itself should be comparable to the downtime caused by a network reconnection

This being said, if you don't neet a network connection, you can disable it by setting OS_NETWORKLESS=true. Or you can tweak the panic action handling script so that it doesn't reboot on network loss (or at all).

I have toyed with the idea of a /etc/network/interfaces file and the underlying mechanism and as far as I remember, it actually works for configuring the interfaces, but it won't do Wi-Fi reconnections.

I know the network connection mechanism is far from ideal and I am open to suggestions, but I can't promise to implement anything that is too disruptive or radically changes the way the system currently works.

[avanc]

Thanks for the background information. I'm considering to keep my changes small an possible: Do not stop boot process, by doing a reboot with higher delay (e.g. 1 hour) so the photoframe is showing pictures most of the time.