TDQ-9543 Netezza DB: Error When Attempting to View Keys or Indexes
1) let Netezza Jdbc connection same with Netezza connection: only show one catalog
2) uppercase the database name when check Netezza connection
Merge pull request #104 from xqliu-talend/maintenance/5.6

TDQ-9543 Netezza DB: Error When Attempting to View Keys or Indexes