HDFS-4446. Support file snapshots with diff lists.


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HDFS-4480. Eliminate the file snapshot circular linked list.


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Merge r1441206 through r1444434 from trunk.


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HDFS-4481. Change fsimage to support snapshot file diffs.


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HDFS-4500. Refactor snapshot INode methods.


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HDFS-4487. Fix snapshot diff report for HDFS-4446.  Contributed by Jing Zhao


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Merge trunk to HDFS-2802 branch

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HDFS-4431. Support snapshot in OfflineImageViewer.  Contributed by Jing Zhao


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HDFS-4503. Update computeContentSummary(..), spaceConsumedInTree(..) and diskspaceConsumed(..) in INode for snapshot.


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HDFS-4499. Fix file/directory/snapshot deletion for file diff.  Contributed by Jing Zhao


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Merge r1446505 through r1448504 from trunk.


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HDFS-4524. Update SnapshotManager#snapshottables when loading fsimage.  Contributed by Jing Zhao


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HDFS-4520. Support listing snapshots under a snapshottable directory using ls.  Contributed by Jing Zhao


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Add the new test file by HDFS-4520.


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HDFS-4514. Add CLI for supporting snapshot rename, diff report, and snapshottable directory listing.  Contributed by Jing Zhao


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Merge r1448505 through r1449957 from trunk.


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HDFS-4523. Fix INodeFile replacement, TestQuota and javac errors from trunk merge.


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HDFS-4507. Update quota verification for snapshots.


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HDFS-4545. With snapshots, FSDirectory.unprotectedSetReplication(..) always changes file replication but it may or may not changes block replication.


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Merge r1449958 through r1453659 from trunk.


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