HADOOP-10757. KeyProvider KeyVersion should provide the key name. (asuresh via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1607896 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10719. Add generateEncryptedKey and decryptEncryptedKey methods to KeyProvider. (asuresh via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1607918 13f79535-47bb-0310-9956-ffa450edef68