from transient errors (heartbeast misses). In case of transient
errors OverlayForwarder is marked to be unhealty. When overlay forwarder
is unhealty its hept on hold so chooseBest() will skip selecting the forwrder
Once OverlayForwarder is considered healthy run chooseBest() again so the
forwarder can be selected if its the best forwarder
Fixes#1737
If overlay encryption is required between peers, the fast datapath
forwarder returns an error rather than aborting the process, allowing
the overlay switch to fall back gracefully to an encrypted sleeve
overlay connection.
This is mostly a matter of moving some files, changing package names,
changing some imports, and changing some type references.
We duplicate the odd constant & global var, and the intmac/macint
functions, since neither 'router' or 'mesh' nor, really,' common' are
a natural home for them.
...since the main connections only need to know about the former.
We make LocalConnection.Overlay (formerly '.forwarder') public since
the router needs access to it, and it shouldn't be doing that via a
private field.
Bryan Boreham