FTP: make the data connection work when going through proxy

This is a regression since the switch to always-multi internally
c43127414d.

Test 1316 was modified since we now clearly call the Curl_client_write()
function when doing the LIST transfer part and then the
handler->protocol says FTP and ftpc.transfertype is 'A' which implies
text converting even though that the response is initially a HTTP
CONNECT response in this case.

lib/socks.c

@@ -129,6 +129,8 @@ CURLcode Curl_SOCKS4(const char *proxy_name,
 
   curlx_nonblock(sock, FALSE);
 
+  infof(data, "SOCKS4 communication to %s:%d\n", hostname, remote_port);
+
   /*
    * Compose socks4 request
    *
@@ -182,6 +184,8 @@ CURLcode Curl_SOCKS4(const char *proxy_name,
       else
         hp = NULL; /* fail! */
 
+      infof(data, "SOCKS4 connect to %s (locally resolved)\n", buf);
+
       Curl_resolv_unlock(data, dns); /* not used anymore from now on */
 
     }