putting groovy in right package (org.apache.tomee) + using tomee-admin role (the one we add by default) + adding tomee mvn plugin in webaccess-gui to be able to run mvn tomee:run and test on localhost:8080 + removing ejb-jar/beans/persistence.xml which were useless and creating datasources/implying more logic

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1524912 13f79535-47bb-0310-9956-ffa450edef68