Add 'self' parameters to function Cluster::update_pods, use variable name...

Add 'self' parameters to function Cluster::update_pods, use variable name 'cur_proxy' instead of 'proxy' in file 'tools/get_pr_ut.py' (#33377)

* undefined variable proxy

* Cluster::update_pods lacks of parameter self

python/paddle/distributed/utils.py

@@ -166,7 +166,7 @@ class Cluster(object):
     def __ne__(self, cluster):
         return not self.__eq__(cluster)
 
-    def update_pods(cluster):
+    def update_pods(self, cluster):
         self.pods = copy.copy(cluster.pods)
 
     def trainers_nranks(self):

tools/get_pr_ut.py

@@ -112,7 +112,7 @@ class PRChecker(object):
                 print(e)
                 print(
                     'PREC download {} error, retry {} time(s) after {} secs.[proxy_option={}]'.
-                    format(url, ix, ix * 10, proxy))
+                    format(url, ix, ix * 10, cur_proxy))
                 continue
             else:
                 return True