remove redundant additionalDetails.html and add docs to CapabilityDescription in HDFS processors
revert the modified CapabilityDescriptions in HDFS processors and add it to AbstractHadoopProcessor
- Creating nifi-records-utils to share utility code from record services
- Refactoring Parquet tests to use MockRecorderParser and MockRecordWriter
- Refactoring AbstractPutHDFSRecord to use schema access strategy
- Adding custom validate to AbstractPutHDFSRecord and adding handling of UNION types when writing Records as Avro
- Refactoring project structure to get CS API references out of nifi-commons, introducing nifi-extension-utils under nifi-nar-bundles
- Updating abstract put/fetch processors to obtain the WriteResult and update flow file attributes
This closes#1712.
Signed-off-by: Andy LoPresto <alopresto@apache.org>