[cygnus-ngsi][OrionHDFSSink] Add support for Parquet format in OrionHDFSSink

[frbattid]

Apache Parquet is a columnar storage format available to any project in the Hadoop ecosystem, regardless of the choice of data processing framework, data model or programming language. (http://parquet.incubator.apache.org/)

Parquet is a format some times requested by FIWARE users as a useful way of persisting historical Orion context data in HDFS.

Adding this new format will imply the extension of the available values about the file_format configuration parameter in NGSIHDFSSink (currently, json-row, json-column, csv-row and csv-column. We will be adding parquet-row and parquet-column, if such a distiction is possible, of simply parquet.

[frbattid]

Some interesting references:

• http://blog.cloudera.com/blog/2014/05/how-to-convert-existing-data-into-parquet/
• CSV to Parquet and viceversa: https://github.com/Parquet/parquet-compatibility/blob/master/parquet-compat/src/test/java/parquet/compat/test/ConvertUtils.java