Parquet Combine Input format for MapReduce job

ParquetInputFormat can only process one parquet file, if there are small files, it will spawn many small map task processing the small file. It is not efficient.
We need to provide CombineInputFormat to combine small files together in one map task.

**Reporter**: [Bing Jiang](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=jiangbinglover)

_{**Note**: *This issue was originally created as [PARQUET-1051](https://issues.apache.org/jira/browse/PARQUET-1051). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}