HDFS-4785. Concat operation does not remove concatenated files from InodeMap. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478267 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4784. NPE in FSDirectory.resolvePath(). Contributed by Brandon Li.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478276 13f79535-47bb-0310-9956-ffa450edef68