Fix set coreos hostname failed (#3599)

need set hostname by kubeadm

roles/bootstrap-os/tasks/main.yml

@@ -65,7 +65,6 @@
   command: "hostnamectl set-hostname  {{inventory_hostname}}"
   register: hostname_changed
   when:
-    - ansible_hostname == 'localhost'
     - ansible_distribution in ['openSUSE Tumbleweed'] or ansible_os_family in ['CoreOS', 'Container Linux by CoreOS']
     - override_system_hostname