[ISSUE #4681] Fix miss line break for query config.

[shiyiyue1102]

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What is the purpose of the change

Fix #4681 .

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[CherishCai]

这份文件应该是 配置保存时候写数据库，并各个 Server 都维护 local file 备份，那么这个换行的符号很难说下？如果是多个换行符，或者有 \r\n 等存在？
感觉直接读 file 字节 然后转字符串是最好的实现？
org.apache.commons.io.FileUtils.readFileToString(file);

@shiyiyue1102 @KomachiSion