SQOOP-820: Escape table name in export job only if it's required by connector

(Jarek Jarcec Cecho via Cheolsoo Park)
SQOOP-818: Missing method setConnManager(Lcom/cloudera/sqoop/manager/ConnManager;)V in
ExportJobContContext breaks MS SQL Connector

(Jarek Jarcec Cecho via Cheolsoo Park)