use technique documented at http://maven.apache.org/plugins/maven-checkstyle-plugin/examples/multi-module-config.html to enable shared checkstyle config among modules

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/proxy/branches/version-2.0-work@967239 13f79535-47bb-0310-9956-ffa450edef68
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