[Battlemesh] battlemesh v6 test data postprocessing

[Juliusz Chroboczek]

> "Operation not permitted" is what you get if you trigger a REJECT rule
> in the local firewall.

Just to clarify -- this is probably an honest mistake.  If Babel
failed to install a host route, the kernel could have attempted to
follow a default route installed by some other protocol, which would
have been shot down by the firewall.

Unfortunately, if the first SYN triggers a REJECT, then connect will
give up immediately -- so we never get a second chance to connect.

I'd really need to see the firewall setup to be sure.

-- Juliusz