HADOOP-9908. Fix NPE when versioninfo properties file is missing. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1520335 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5159. Secondary NameNode fails to checkpoint if error occurs downloading edits on first checkpoint. Contributed by Aaron T. Myers.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1520366 13f79535-47bb-0310-9956-ffa450edef68