XD-988

This PR demonstrates the code for the HDFS to JDBC export job (XD-988) and also contains the XD-984 work on file to JDBC import for comparison (and on which it depends). There's a lot of overlap so it would be nice to have some way of sharing configuration between modules.

Note also that the issue with Spring HADOOP (SHDP-201) which prevents the easy use of both HDFS and file resources in the same module, thus preventing the use of the same DB initialization code from the file->JBDC module. I've commented this out for now and relied on manually pre-creating the database table.