Fix tcp logs when connection is closed (#2572)
Fix tcp logs when connection is closed (#2572)

When a client closes tcp connection , debug log shows

```
[Sep 27 14:08:31] DEBUG tcp-proxy: End of client stream conn=127.0.0.1:63379->127.0.0.1:8585
```

Fixes #2571

lonelycode/tyk,lonelycode/tyk,lonelycode/tyk