command to clear swarm dial backoff

[whyrusleeping]

while diagnosing some network issues, i often hit the 'dial backoff', where our node decides we've tried to dial that other node enough times, its probably dead, and we wait a little while to try again.

This sucks when i'm manually trying to dial things. We should have a command to clear this, or to ignore the backoff somehow if we are manually running swarm connect commands.

This will likely involve work in both libp2p and go-ipfs