Create branch HDFS-4685 for development of HDFS ACLs.

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HDFS-4685. Add CHANGES-HDFS-4685.txt.

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Merge trunk to HDFS-4685.

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Merge trunk to HDFS-4685.

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Merge trunk to HDFS-4685.

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HDFS-5594. FileSystem API for ACLs. Contributed by Chris Nauroth.

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HDFS-5650. Remove AclReadFlag and AclWriteFlag in FileSystem API. Contributed by Haohui Mai.

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HDFS-5596. Implement RPC stubs. Contributed by Haohui Mai.

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Merge trunk to HDFS-4685.

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Merge trunk to HDFS-4685.

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HDFS-5685. Implement ACL as a INode feature. Contributed by Haohui Mai.

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Merge trunk to HDFS-4685.

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HDFS-5618. NameNode: persist ACLs in fsimage. Contributed by Haohui Mai.

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HDFS-5619. NameNode: record ACL modifications to edit log. Contributed by Haohui Mai.

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Merge trunk to HDFS-4685.

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Update CHANGES-HDFS-4685.txt for several issues that have been converted to Hadoop Common sub-tasks of HADOOP-10184.

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HADOOP-10187. add getfacl and setfacl with minimal support for getting and setting ACLs. Contributed by Vinay.

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HADOOP-10192. FileSystem#getAclStatus has incorrect JavaDocs. Contributed by Chris Nauroth.

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HDFS-5673. Implement logic for modification of ACLs. Contributed by Chris Nauroth.

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Merge trunk to HDFS-4685.

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