SQOOP-1454: Sqoop2: From/To: Add client support for supported directions

(Abraham Elmahrek via Jarek Jarcec Cecho)
SQOOP-1488: Sqoop2: From/To: Run both destroyers

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