SQOOP-1349: Sqoop2: Use configurable writable to get Intermediate Data Format

(Veena Basavaraj via Abraham Elmahrek)
SQOOP-1724: Sqoop2: Support old config types for backward compatibility in connector data upgrade

(Veena Basavaraj via Jarek Jarcec Cecho)
SQOOP-1727: Sqoop2: Log server initialization errors to log4j

(Vinoth Chandar via Abraham Elmahrek)
SQOOP-1721: Sqoop2: common jars missing for MR job

(Qian Xu via Jarek Jarcec Cecho)