Time Sync appears to only work with IPv4

[kd8bxp]

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I've installed this on a couple of PIs already - so far everything is working great. Last week we got a new router that issues IPv6 t - and I noticed that one of the PIs wasn't showing up. I forced it to IPv4 and it appears to work now. I think it has something to do with the time sync, because that is what appears to be failing when I only have a IPv6 address. Here is what I did to fix it - and it appears to work for me https://raspberrypi.stackexchange.com/questions/23884/force-ipv4-address