correct way to specify random listen port

Author: willmafh

t/165-proxy-ssl-cert-by.t

@@ -863,7 +863,7 @@ proxy_ssl_certificate_by_lua: cert cb aborted
 === TEST 21: cosocket
 --- stream_config
     server {
-        listen *:80;
+        listen 127.0.0.1:$TEST_NGINX_RAND_PORT_1;
 
         return "it works!\n";
     }
@@ -893,7 +893,7 @@ proxy_ssl_certificate_by_lua: cert cb aborted
             local sock = ngx.socket.tcp()
             sock:settimeout(2000)
 
-            local ok, err = sock:connect("127.0.0.1", "80")
+            local ok, err = sock:connect("127.0.0.1", $TEST_NGINX_RAND_PORT_1)
             if not ok then
                 ngx.log(ngx.ERR, "failed to connect: ", err)
                 return