fix unstable stats test; the open_os_files counter needs a separate test
fix unstable stats test; the open_os_files counter needs a separate test

git-svn-id: c1f8a8ec0b3bb2e99ab3413722f81f687760e79c@757744 13f79535-47bb-0310-9956-ffa450edef68

apache/couchdb-futon,apache/couchdb-futon