Cozy proxy listens on a couple of high ports with no apparent need

`netstat` shows these two lines

```
tcp6       0      0 :::40267                :::*                    LISTEN      109979/cozy-proxy   
tcp6       0      0 :::33869                :::*                    LISTEN      109979/cozy-proxy   
```

there doesn't seem to be a need for cozy-proxy to listen on these ports.