[Hadoop] Guard useradd against existing user account
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Key: WHIRR-178
URL: https://issues.apache.org/jira/browse/WHIRR-178
Project: Whirr
Issue Type: Improvement
Affects Versions: 0.3.0
Reporter: Lars George
Assignee: Lars George
Priority: Trivial
Fix For: 0.3.0
When sharing clusters with other services there may be a race to create the
user "hadoop". Add a check that tests before adding the user.
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