there was a race where ip-up could write ifname and then
ip6-up could write its outputs and then test ifname and
signal ready before ip-up had written the rest of its outputs
because what happens if the service is restarted but the new ppp0 is
a different interface than the old one so that services which had
bound to it with the old name are now not getting new data
(I am not 100% that this actually happens but it seems like it would
be good to avoid it if it does)
There is nothing in this commit except for the changes made by
nix-shell -p nixfmt-rfc-style --run "nixfmt ."
If this has mucked up your open branches then sorry about that. You
can probably nixfmt them to match before merging
