Fix setenforce failed while selinux is disabled
Fix setenforce failed while selinux is disabled

Signed-off-by: Linggang Zeng <839f01ea4ad1f8af5bb700e317d8c830897f016e@easystack.cn>

dmick/teuthology,SUSE/teuthology,ktdreyer/teuthology,dmick/teuthology,dmick/teuthology,ktdreyer/teuthology,ceph/teuthology,ceph/teuthology,SUSE/teuthology,SUSE/teuthology