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[SPARK-17583][SQL] Remove uesless rowSeparator variable and set auto-…
…expanding buffer as default for maxCharsPerColumn option in CSV ## What changes were proposed in this pull request? This PR includes the changes below: 1. Upgrade Univocity library from 2.1.1 to 2.2.1 This includes some performance improvement and also enabling auto-extending buffer in `maxCharsPerColumn` option in CSV. Please refer the [release notes](https://github.com/uniVocity/univocity-parsers/releases). 2. Remove useless `rowSeparator` variable existing in `CSVOptions` We have this unused variable in [CSVOptions.scala#L127](https://github.com/apache/spark/blob/29952ed096fd2a0a19079933ff691671d6f00835/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVOptions.scala#L127) but it seems possibly causing confusion that it actually does not care of `\r\n`. For example, we have an issue open about this, [SPARK-17227](https://issues.apache.org/jira/browse/SPARK-17227), describing this variable. This variable is virtually not being used because we rely on `LineRecordReader` in Hadoop which deals with only both `\n` and `\r\n`. 3. Set the default value of `maxCharsPerColumn` to auto-expending. We are setting 1000000 for the length of each column. It'd be more sensible we allow auto-expending rather than fixed length by default. To make sure, using `-1` is being described in the release note, [2.2.0](https://github.com/uniVocity/univocity-parsers/releases/tag/v2.2.0). ## How was this patch tested? N/A Author: hyukjinkwon <gurwls223@gmail.com> Closes #15138 from HyukjinKwon/SPARK-17583.
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