User uppercase identifiers in InsertTest.testInsertOrUpdateAutoInc.

Oracle and DB2 require non-quoted identifiers for auto-generated
columns that are returned from INSERTs. testReturning already uses
uppercase names for the same reason.
Merge pull request #821 from slick/tmp/lowercase-upsert-identifiers

User uppercase identifiers in InsertTest.testInsertOrUpdateAutoInc.