remove accept_mutex and mutli_accept as superceded by reuseport

lb_configs/nginx.conf

@@ -5,8 +5,6 @@ worker_rlimit_nofile 300000;
 events {
     worker_connections  16000;
     use epoll;
-    accept_mutex on;
-	multi_accept on;
 }
 
 thread_pool pool_xc_vm threads=32 max_queue=0;
@@ -239,4 +237,4 @@ http {
             return 404;
         }
     }
-}
+}