Fix broken Hadoop download (#2221)
Fix broken Hadoop download (#2221)

The `mirrors.cgi` does not work for any of the current Hadoop releases. This
refactors to use `closest.cgi`.

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TYPE: NO_HISTORY

Co-authored-by: Joe Maley <16a9a54ddf4259952e3c118c763138e83693d7fd@tiledb.com>
TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB