Cleanup DatanodeID creation in the tests
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Key: HDFS-3230
URL: https://issues.apache.org/jira/browse/HDFS-3230
Project: Hadoop HDFS
Issue Type: Improvement
Components: test
Reporter: Eli Collins
Assignee: Eli Collins
Priority: Minor
A lot of tests create dummy DatanodeIDs for testing, often use bogus values
when creating the objects (eg hostname in the IP field), which they can get
away with because the IDs aren't actually used. Let's add a test utility method
for creating a DatanodeID for testing and use it throughout.
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