release Parquet-mr 1.9.1

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Reporter: Julien Le Dem / @julienledem

Related issues:

• Upgrade Parquet to 1.9 (Fixes parquet sorting) (blocks)
• H2SeekableInputStream does not close its underlying FSDataInputStream, leading to connection leaks (is blocked by)
• allow unsigned binary stats when min == max (is blocked by)

_{Note: This issue was originally created as PARQUET-1027. Please see the migration documentation for further details.}

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Gaurav Shah: Any reason to not make a release since both the issues are closed for 1.9.1 ?

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Michael MacFadden / @mallman: Ping @julienledem @rdblue. Please release 1.9.1. Thank you.

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Ryan Blue / @rdblue: @mallman, does 1.10 work for you, or do you need compatibility with 1.9.x?

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Jean-Baptiste Onofré: Just my $0.01: 1.10 or 1.9.1 is fine for me.

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Michael MacFadden / @mallman: @rdblue, sorry I missed your reply. ~~Yes, I need compatibility with 1.9.x. We're on a private fork of 1.9.0. It would be nice to get back to a public release. I've tried integrating 1.10.0 into our source, and there are too many changes in the API for me to comprehend.~~ No, I think we're going to revert to 1.8.3 and use 1.10.0 with Spark 2.4.

Thank you.