SQOOP-874: Provide log4j configuration for client

(Jarcec Cecho via Cheolsoo Park)
SQOOP-875: ClassUtils.instantiate class should not be logging on ERROR level

(Jarcec Cecho via Cheolsoo Park)
SQOOP-879: NPE when deleting job object that do not have associated any submissions

(Jarcec Cecho via Cheolsoo Park)
SQOOP-881: Change default port from 8080

(Jarcec Cecho via Cheolsoo Park)
SQOOP-880: NPE when stopping job that was never executed

(Jarcec Cecho via Cheolsoo Park)