is_running()里的打开pid文件的操作已经在get_pid()中执行过了,不需要再次执行 (#2335)

jms

@@ -108,8 +108,7 @@ def is_running(s, unlink=True):
     pid_file = get_pid_file_path(s)
 
     if os.path.isfile(pid_file):
-        with open(pid_file, 'r') as f:
-            pid = get_pid(s)
+        pid = get_pid(s)
         if check_pid(pid):
             return True