Improve libp2p connection logs

[corverroos]

Problem to be solved

We currently log libp2p connection issues in three places:

• p2p/ping.go
• p2p/sender.go
• p2p/relay.go

Most connection logs are however swarm.ErrDialBackoff which provide no information and is just noise and it hides the actual reason for connection issue making debugging and resolving network issues very hard.

Proposed solution

Clean up libp2p errors:

• Add a function p2p.ConvertErr(error) error that converts libp2p swarm.DialErrors to our error format.
• Remove noisy variables from message
• pick the first error in the batch (add other errors as fields)
• Add a p2p.IsNoisyErr function that returns true if the error is swarm.ErrDialBackoff
• Do not log noisy errors in p2p/sender.go, p2p/relay.go
• Add tests for all of these

Refactor ping.go:

• Use expbackoff for better backoff and retry and less noisy logs.
• Set hysteresis=1 maybe
• When p2p.IsNoisyErr do host.Connect with network.WithForceDirectDial to obtain real error.
• Test this manually via compose