stats: Add support for func based export vars.
Kludgy test for queryservice_test.py.
stats: change states to int64
Merge branch 'tmp-fix-tests' of github.com:youtube/vitess into tmp-fix-tests
Merge branch 'tmp-fix-tests' into sougou-work
Voltron expvar exported as individual vars
Add VT vars to tests
Remove VT prefix from exported vars
bug fix: typo on pool check.