Merge pull request #171 from projoy/master

在docker中启动多个gunicorn进程时，偶发异常"File exists',导致服务启动失败

nacos/client.py

@@ -259,7 +259,7 @@ def initLog(self, logDir, log_level, log_rotation_backup_count):
         if not logDir.endswith(os.path.sep):
             logDir += os.path.sep
         if not os.path.exists(logDir):
-            os.makedirs(logDir)
+            os.makedirs(logDir, exist_ok=True)
 
         if log_rotation_backup_count is None:
             log_rotation_backup_count = 7