YARN-822. Renamed ApplicationToken to be AMRMToken, and similarly the corresponding TokenSelector and SecretManager. Contributed by Omkar Vinit Joshi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1493889 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'apache/trunk' into YARN-834
Fix NMClient javadoc, add package-info, clean unused import