[KARAF-2224] generate-features-xml mojo now supports classifier

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.3.x@1459281 13f79535-47bb-0310-9956-ffa450edef68
[KARAF-2636] Improve security mechanism
[KARAF-2636] Improve security mechanism
[KARAF-2554] Downgrade to Felix ConfigAdmin 1.6.0