SQOOP-1515: VersionRequestHandler - fixes

(Veena Basavaraj via Jarek Jarcec Cecho)
SQOOP-1605: Sqoop2: Misc From/to cleanups

(Abraham Elmahrek via Jarek Jarcec Cecho)
Sqoop2: Ensure Connector/Driver/Version only support GET method

(Veena Basavaraj via Abraham Elmahrek)
SQOOP-1620: Sqoop2: FileSystem should be configurable in HDFS connector

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1597: Sqoop2: Refactor DerbySchemaQuery into one for create/ update/ and then CRUD operarations

(Veena Basavaraj via Jarek Jarcec Cecho)
SQOOP-1576: Sqoop2: Validations: Migrate Repository upgrade to the new validator infrastructure

(Jarek Jarcec Cecho via Abraham Elmahrek)
SQOOP-1513: Sqoop2: Refactor LinkRequestHandler

(Veena Basavaraj via Abraham Elmahrek)