qa_crowbarsetup: move node filter to a function
qa_crowbarsetup: move node filter to a function

gosipyan/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,gosipyan/automation,vmoravec/automation,SUSE-Cloud/automation,gosipyan/automation,SUSE-Cloud/automation,vmoravec/automation,aspiers/automation,vmoravec/automation,vmoravec/automation,aspiers/automation,SUSE-Cloud/automation