* Improve logging in network gossip

This adds some more information to the logging output to get a better
understanding when something fails.

* Update client/network-gossip/src/state_machine.rs

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>