SQOOP-1733: Port SQOOP-1728 to sqoop2 branch

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1741: Port SQOOP-1736 to sqoop2 branch

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1754: Sqoop2: Remove JarUtil class

(Qian Xu via Jarek Jarcec Cecho)
SQOOP-1767: Sqoop2: commands in 5 minute demo docs are out-of-sync

(Qian Xu via Abraham Elmahrek)