SQOOP-1651: Sqoop2: Cleanup: Naming and ordering of methods in Repo relates classes

(Veena Basavaraj via Abraham Elmahrek)
SQOOP-1640: Sqoop2: Add the rest of the patch
SQOOP-1655: SQOOP2 DOC: Document getSchema() and its use in the connector dev guide

(Gwen Shapira via Jarek Jarcec Cecho)
SQOOP-1653: Link and connector handler minor fixes

(Veena Basavaraj via Jarek Jarcec Cecho)