Tests: fixed realip.t with parallel tests.

Testing $server_port to be 8081 as added in c0075a0a2ba9 is wrong,
since with parallel tests real port number may be different.

Author: mdounin

realip.t

@@ -41,13 +41,8 @@ http {
 
     server {
         listen       127.0.0.1:8080;
-        listen       127.0.0.1:8081;
         server_name  localhost;
 
-        if ($server_port = 8081) {
-            return 204;
-        }
-
         location / { }
         location /custom {
             real_ip_header    X-Real-IP-Custom;
@@ -63,6 +58,13 @@ http {
             real_ip_recursive on;
         }
     }
+
+    server {
+        listen       127.0.0.1:8081;
+        server_name  localhost;
+
+        return 204;
+    }
 }
 
 EOF