oozie.service.HadoopAccessorService.action.configurations should overwrite default values set in Hadoop's configuration files

When Oozie process the files defined in oozie.service.HadoopAccessorService.action.configurations it uses Configuration.injectDefauts(). This prevents overwriting things defined inside any of the configuration files Oozie is providing default values from (like yarn-site.xml, mapred-site.xml)