Allow client to get a new generation stamp from NameNode
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Key: HDFS-592
URL: https://issues.apache.org/jira/browse/HDFS-592
Project: Hadoop HDFS
Issue Type: Sub-task
Components: hdfs client
Affects Versions: Append Branch
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: Append Branch
This issue aims to
1. add nextGenerationStamp API to ClientProtocol that fetches a new generation
stamp and an access token from NameNode;
2. change append so it additonally returns a new generation stamp and an access
token.
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