TEIID-2704 refining the fix to include derby
Conflicts:

	connectors/translator-jdbc/src/main/java/org/teiid/translator/jdbc/db2/BaseDB2ExecutionFactory.java
	connectors/translator-jdbc/src/main/java/org/teiid/translator/jdbc/db2/DB2ExecutionFactory.java
	connectors/translator-jdbc/src/main/java/org/teiid/translator/jdbc/derby/DerbyExecutionFactory.java
	connectors/translator-jdbc/src/test/java/org/teiid/translator/jdbc/derby/TestDerbySQLTranslator.java