panda_util: 去掉邮件服务的依赖

Signed-off-by: binren <zhangbr@elab-plus.com>

panda_util.py

@@ -1,6 +1,4 @@
 from mysql_db import MysqlDB
-import pandas as pd
-from email_util import EmailUtil
 
 
 class PandaUtil(object):