Hadoop QA Precommit build keeps failing with release audit warning for phoenix-server/dependency-reduced-pom.xml

I believe this is introduced by some changes related to the maven-shaded plugin. We create a dependency-reduced-pom.xml which is considered during the license header check, thus always causing preCommit to fail on this step. We should prevent its creation perhaps via something like this. Example of a failing build's error:

1 Unknown Licenses

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Files with unapproved licenses:

  /home/jenkins/jenkins-slave/workspace/PreCommit-PHOENIX-Build/phoenix-server/dependency-reduced-pom.xml

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