[KARAF-2942] A couple more features/core JDK7 enhancement
[KARAF-2888] Remove unnecessary code (bundle start levels are handled separately now)
[KARAF-2888] Support updates on the FeaturesService bundle itself

This is done by updating the bundle separately and writing a file with resolution request so that when the service is restarted, the full resolution will happen
[KARAF-2930] Remove annoying warning when not using any global repository