Persist the epoch received by the JournalService
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Key: HDFS-3212
URL: https://issues.apache.org/jira/browse/HDFS-3212
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Affects Versions: Shared journals (HDFS-3092)
Reporter: Suresh Srinivas
epoch received over JournalProtocol should be persisted by JournalService.
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