DERBY-6117: Allow StringColumnVTIs to change their column names (once) based on their runtime environment; tests passed cleanly for me on derby-6117-02-aa-changeColumnNamesInStringColumnVTI.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1563135 13f79535-47bb-0310-9956-ffa450edef68