Improve logging

The logging of `TcpTuple` is currently:

```
{%!s(uint32=167772674) %!s(uint32=167772687) %!s(uint16=49779) %!s(uint16=80) %!s(uint32=1)}
```

This changes it to:

```
TcpTuple src[10.0.2.2:49813] dst[10.0.2.15:80] stream_id[1]
```