Update RedisConnectionUtils.java

[miaogr86]

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修复 外层没有事务或者只读事务情况下，配置了enableTransactionSupport=true，redis连接没有关闭问题

[mp911de]

Hi,
could you please tell us about the problem (in English) you're trying to solve by this pull request?

[miaogr86]

The outer layer without spring transaction or read-only transactions, RedisTemplate configure enableTransactionSupport=true, redis connection is not close

[miaogr86]

http://blog.oneapm.com/apm-tech/778.html

see chapter ：Spring Data Redis 中的事务陷阱

[mp911de]

Thanks for raising this PR. We weren't aware of the issue. We are solving this issue with a slightly different approach, see https://jira.spring.io/browse/DATAREDIS-548, therefore I'm closing this PR.