Better info on node errors

[smsearcy]

Currently, when unable to connect to a node the IP address is logged but no database entry is created, and thus any links to that node are not created (even though the new API provides a fair amount of data about the link).

A better solution would seem to be doing a reverse DNS lookup on the IP address, so that with a name and IP we should have enough information to create a minimal node entry and thus can populate the links from the "good" side of the link.

I have a branch (in GitLab?) where I have most of the reverse DNS code working. Need to polish that up and then incorporate it into the error processing.

[smsearcy]

This could work if the node is temporarily having problems (i.e. we have a record for the node), otherwise there won't be any coordinates for mapping.

[smsearcy]

Reviewing this issue, I think I've done everything I can for now so I'm closing it.