Fix the test-alter-table-add-index, one value should be null , not
"null" (no quotes) for the FTS system to process. 

The test-trim.yaml was being complained about by my eclipse yaml parser,
so decided to fix it too.
Revert changes to test-trim.yaml
merge tjoneslo: Fix the test-alter-table-add-index, one value should be null

Merge pull request #1362 from tjoneslo/sql-layer/fix-fts-alter-table-add-index
https://github.com/FoundationDB/sql-layer/pull/1362