Roll back parquet-mr 1.8.2 to parquet-1.8.1

We recently realized that parquet-mr 1.8.2 used by Spark 2.2.0-rc2 depends on avro 1.8.1, which is incompatible with avro 1.7.6 used by parquet-mr 1.8.1 and avro 1.7.7 used by spark-core 2.2.0-rc2.

Basically, Spark 2.2.0-rc2 introduced two incompatible versions of avro (1.7.7 and 1.8.1). Upgrading avro 1.7.7 to 1.8.1 is not preferable due to the reasons mentioned in PR #17163. Therefore, we don't really have many choices here and have to roll back parquet-mr 1.8.2 to 1.8.1 to resolve this dependency conflict.