Fixing future 'tag' to match those that are documented in doc/developer/bestPractices/testSystem.txt

The future_stats script uses these tags to scrape the futures for the
STATUS file.



git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@23666 3a8e244f-b0f2-452b-bcba-4c88e055c3ca