Add a set of maven pom.xml files for Sonar, a few workaround are
necessary, but overall this now allows to compile and run test for
all Apache POI components using Maven, which is a pre-requisite to
be analyzed at http://nemo.sonarqube.org/

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1568613 13f79535-47bb-0310-9956-ffa450edef68