Update hdfs design doc to consider HA NNs
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Key: HDFS-3115
URL: https://issues.apache.org/jira/browse/HDFS-3115
Project: Hadoop HDFS
Issue Type: Bug
Components: documentation
Affects Versions: 0.24.0, 0.23.3
Reporter: Todd Lipcon
Priority: Minor
The hdfs_design_doc.xml still references the NN as an SPOF, which is no longer
true. We should sweep docs for anything else that seems to be out of date with
HA.
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