druid连接池配置参数放开test-on-borrow

[vincent50411]

Why you need it?

私有云环境网络波动不可控，druid连接池异常连接别应用拿到后不做检查（空闲检测时间无法修改，且连接不可替换），导致异常连接一直存在，进而导致应用异常，必须手动重启seata服务。

How it could be?

建议将这4个字段作为配置参数放开，让应用放灵活配置。 ds.setTimeBetweenEvictionRunsMillis(120000); ds.setMinEvictableIdleTimeMillis(300000); ds.setTestWhileIdle(true); ds.setTestOnBorrow(false);

[xingfudeshi]

Hi i will add this feature in next release.

[zrlw]

ds.setTestWhileIdle(true);

druid空闲保活还需要设置keepAlive为true，否则无效

[xingfudeshi]

@vincent50411 Hello, please take a look at this PR and see if it meets your needs?