客户端使用sentinel-datasource-redis出现连接数不能释放问题

## Issue Description

Type: *bug report* or *feature request*

### Describe what happened (or what feature you want)
客户端使用sentinel-datasource-redis包，出现了Redis连接数不能释放问题

### Describe what you expected to happen
客户端在使用sentinel-datasource-redis包 能正常释放Redis连接数
或者是使用集成配置有问题。

`目前可以通过关闭sentinel端点信息暂时解决此问题。`

### How to reproduce it (as minimally and precisely as possible)

1. 问题描述和bug demo: https://github.com/lvjianSingle/alibaba-sentienl-datasource-redis-bug
2.
3.

### Tell us your environment
Java1.8、Windows10

### Anything else we need to know?
spring-cloud-alibaba版本：2.2.5.RELEASE
sentinel-dashboard版本：1.8.0
sentinel-datasource-redis版本：1.8.0

Start with the linked bug demo and the sentinel-datasource-redis integration using Java 1.8, Spring Cloud Alibaba 2.2.5.RELEASE, Sentinel Dashboard 1.8.0, and sentinel-datasource-redis 1.8.0. Compare behavior with Sentinel endpoint information enabled and disabled. Done means Redis connections are released normally without disabling endpoint information.

Written by the indexing model from the issue text.