Removed pom clutter for karaf-maven-plugin.
Removed pom clutter for karaf-maven-plugin.

Having the config for the goal features-generate-descriptor on the
plugin level, instead of in the goal executions, makes it possible to
override the settings on the plugin level in the child pom files,
instead of having to replicate the goal excution configuration just to
be able to override a single setting.

steinarb/ukelonn,steinarb/ukelonn,steinarb/ukelonn