GH-446: Add hookup code for XCommands.
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Key: OOZIE-293
URL: https://issues.apache.org/jira/browse/OOZIE-293
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
This issue is to make use of XCommands that have been created previously.
Also, for now we want to make using XCommands configurable. Users can specify
whether to use new XCommands or old commands.
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