HDFS-5679. TestCacheDirectives should handle the case where native code is not available. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1552461 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10141. Create KeyProvider API to separate encryption key storage
from the applications. (omalley)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1552462 13f79535-47bb-0310-9956-ffa450edef68