TEIIDDES-2127 Problem with SF import using Teiid Connection importer - keys not resolved

- in Teiid Connection importer, the DDL is now modified to remove the current schema qualifier - if present.  Teiid is changing this (if the reference is within the schema) - TEIID-2950 - so our modification will have no effect after that change.
- fixed other issue with Connection Importer.  Only occurs when typing in a target model name when another model with same name (but different type) exists in the project.