commit the additional doc change for HDFS-6717

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1615801 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10928. Incorrect usage on . Contributed by Josh Elser.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1615808 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10927. Fix CredentialShell help behavior and error codes. Contributed by Josh Elser.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1615827 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10937. Need to set version name correctly before decrypting EEK. Contributed by Arun Suresh.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1615841 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10936. Change default KeyProvider bitlength to 128. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1615850 13f79535-47bb-0310-9956-ffa450edef68