SQOOP-1686: Sqoop2: Fix the JSON names for config and config values

(Veena Basavaraj via Abraham Elmahrek)
SQOOP-1688: Sqoop2: Fix the Validation Response JSON for configs

(Veena Basavaraj via Abraham Elmahrek)
SQOOP-1687: Sqoop2: Single resource in JSON should not be a list

(Veena Basavaraj via Abraham Elmahrek)