[Feature Request] mention hostname on -v

[Philipp Marek]

I've got a usecase right now where I've got to use a few
intermediate ProxyJump hosts, and it would help debugging
via -v tremendously if the debug lines would have a prefix
of the originating host, so that they can be easily associated.


The FQDN might be too long, though -- perhaps just the PID
with an additional line associating it with the host would be
a better fit?


Thanks!