SQOOP-1430: Sqoop2: From/To: Change shell to take "from" and "to"

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1419: Sqoop2: From/To: Check TO connection is enabled

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1384: Sqoop2: From/To: Refactor Generic JDBC Connector

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1416: Sqoop2: From/To: Investigate multiple variables for "from" and "to"

(Abraham Elmahrek via Jarek Jarcec Cecho)
Merge remote-tracking branch 'remotes/origin/SQOOP-1367' into SQOOP-1367