SQOOP-1042: Sqoop2: Name constraints in Derby repository

(Jarek Jarcec Cecho via Kate Ting)
SQOOP-1043: Sqoop2: Improve error messages in Derby repository

(Jarek Jarcec Cecho via Kate Ting)
SQOOP-1044: Sqoop2: Improve logging in metadata upgrade methods

(Jarek Jarcec Cecho via Kate Ting)
SQOOP-1041: Sqoop2: Framework upgrade in JdbcRepository returns the outdated value

(Jarek Jarcec Cecho via Kate Ting)