HDFS-5923. Do not persist the ACL bit in the FsPermission. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4685@1567784 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5933. Optimize the FSImage layout for ACLs. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4685@1567785 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5932. Ls should display the ACL bit. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4685@1567850 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'HDFS-4685' into HDFS-5937