GH-206: add a dependency management section to main pom
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Key: OOZIE-185
URL: https://issues.apache.org/jira/browse/OOZIE-185
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
Adding a dependency management section to the main POM will allow to manage
versions for all dependencies from a single location.
It also enables to resolve version conflicts in a single location.
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