Fixes #4323 #4322 - Fix wrong result classes of service_ensure_stopped which are based on service_check_running() and remove useless variable about init.d command

Fixes #4323 #4322 - Fix wrong result classes of service_ensure_stopped which are based on service_check_running() and remove useless variable about init.d command

cf http://www.rudder-project.org/redmine/issues/4323

This PR was originaly from https://github.com/Normation/ncf/pull/26