使用XA模式出现java.lang.IllegalArgumentException: endpoint format should like ip:port

使用XA模式
```java
@Bean
public DataSource dataSource() {
return new DataSourceProxyXA(super.createDruidDataSource("account", 5000));
}
```
file.conf
```config
service {
vgroupMapping.dev = "dev"
dev.grouplist = "xx:8091" //另外一台机器部署的seata-server
#degrade, current not support
enableDegrade = false
#disable seata
disableGlobalTransaction = true
}
```
测试出现异常：
```log
java.lang.IllegalArgumentException: endpoint format should like ip:port
```
debug发现 `service.dev.grouplist=127.0.0.1:8091` 为啥取不到我配置的地址呢
spring

Start with the DataSourceProxyXA setup and the file.conf service.dev.grouplist entry, then trace how the XA client loads and parses that endpoint. Reproduce the configuration with the remote xx:8091 address and compare it with the observed 127.0.0.1:8091 value; done means the configured endpoint is used without the format exception.

Written by the indexing model from the issue text.