Name node cannot start if the path of a file under construction contains .snapshot. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613329 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10891. Add EncryptedKeyVersion factory method to KeyProviderCryptoExtension. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613332 13f79535-47bb-0310-9956-ffa450edef68