Fixing version number typeo from 0.23.8-SNAPHOST to 0.23.8-SNAPSHOT

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1469017 13f79535-47bb-0310-9956-ffa450edef68
YARN-72. Forgot to add 2 files to branch-0.23

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1469056 13f79535-47bb-0310-9956-ffa450edef68