Parquet-hadoop's client side logs are buffered / do not print until the job completes

Log statements from the InputFormat or anywhere else in the hadoop client / submitter seem to get buffered until the MR job completes, instead of printing as the job progresses.

**Reporter**: [Alex Levenson](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=alexlevenson) / @isnotinvain

_{**Note**: *This issue was originally created as [PARQUET-27](https://issues.apache.org/jira/browse/PARQUET-27). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}