NetUtils#getHostNameOfIP blows up if given ip:port string w/o port
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Key: HADOOP-8238
URL: https://issues.apache.org/jira/browse/HADOOP-8238
Project: Hadoop Common
Issue Type: Bug
Reporter: Eli Collins
Assignee: Eli Collins
NetUtils#getHostNameOfIP blows up if not given a string of form ip:port,
because the regex matches the port optionally but the code requires a
semicolon. It also doesn't check the given string for null.
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