Tool interface should also support getUsage()
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Key: HADOOP-6866
URL: https://issues.apache.org/jira/browse/HADOOP-6866
Project: Hadoop Common
Issue Type: Improvement
Reporter: Amar Kamat
Currently each and every _tool_ implementing the {{Tool}} interface is forced
to manage their usage string. Since its a common piece of code, its better we
factor it out. This can be useful in the following ways
# A proper lib like support for usage strings
# Forcing _tools_ (implementers of {{Tool}}) to expose their usage string
# Test cases can now use these well defined and exposed usage strings to test
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