Upgrade addons-parent-pom 2 -> 4
Format POMs with :  mvn -Pformat-pom
Add/Fix files headers (copyrights/license) with : mvn -Pfix-headers
eXo parent POM has already java 1.6 as default source/target
Use a random HTTP port to launch tomcat with arquillian from maven (to avoid conflicts on CI server ...)
Remove useless versions duplications