fix: append peer id to connection remote addr if not present

[achingbrain]

If we dial an address like /ip4/123.123.123.123/tcp/123 we'll get a peer id back after the connection upgrade - append it to the remote addr to make it easier to test if we already have a connection to a given multiaddr.

Notes & open questions

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works

[achingbrain]

Srsly, what is happening with the pubsub interop tests?!