Stream proxy ptotocol header corrupted


Nginx sends proxy protocol header without triling "\r\n" when unix socket path is long,

Sample config:

```
strema {
server {
listen *.80;
proxy_pass unix:/var/run/1.socket;
proxy_protocol on;
}

server {
listen unix:/var/run/1.socket prtoxy_protocol;
proxy_pass 127.0.0.1:8080;
proxy_protocol on;
}
}

```

When send simple HTTP GET request to :80 - it;s ok;

But when socket oath is ontr, than 80 chars - nginx sends data like this ( WITHOUT "\r\n" separator after proxy protocol header ):

```
PROXY TCP 1.2.3.4 unix:.... pott1 port2GET
```