Nested jars prevent SonarQube/FindBugs from running

Bundle org.jboss.ide.eclipse.archives.core makes SonarQube analysis fail because it's classes get included in some nested jar (and get to different location that target/classes).
Cf https://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/DevStudio/view/DevStudio_Sonar/job/jbosstools-server.sonar_master/4/console

[ERROR] Failed to execute goal org.codehaus.mojo:sonar-maven-plugin:2.4:sonar (default-cli) on project server.all: Can not execute SonarQube analysis: Can not execute Findbugs: Findbugs needs sources to be compiled. Please build project before executing sonar and check the location of compiled classes. -> [Help 1]

This is an exploded bundles with nested jars, we should investigate whether it's possible to turn it into a more standard jar, which would still be usable in its Ant version. Cf ./archives/tests/org.jboss.ide.eclipse.archives.test/inputs/projects/SimpleAntTest

Also, the jvmmonitor bundles use nested jars. We should avoid that too.