SQOOP-1449: Sqoop2: From/To: Re-enable common tests

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1455: Sqoop2: From/To: Re-enable MapreduceExecutionEngine tests

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1451: Sqoop2: From/To: Add API for supported directions

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