minEvictableIdleTimeMillis的配置，最终链接不释放

当前版本：1.0.15，hibernate3
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上面是我的配置，问题是这样的：我的程序在做一个30万的数据查询，活跃连接数一直在上涨，中间不释放链接，到峰值170左右，重点问题就是在程序跑完以后，池中链接一直都是峰值状态，除非重启服务才能解决。后来我在测试过程中，将这个参数minEvictableIdleTimeMillis调小到1分钟以内就不会有上述问题，不太理解这个最终不释放是什么原因，代码没变，就是修改minEvictableIdleTimeMillis这个参数。

Start by reproducing the 300,000-row query with the reported Druid 1.0.15 and hibernate3 settings, comparing minEvictableIdleTimeMillis values. Then trace the connection-pool handling of timeBetweenEvictionRunsMillis, minIdle, and eviction timing; done means identifying why idle connections remain at peak and documenting or verifying the release behavior.

Written by the indexing model from the issue text.