Revert "Use raw command for shutdown task"

This reverts commit 31de83b3ff.

Raw poweroff command only needed on CoreOS because it doesn't have
Python

metal/shutdown.yml

@@ -3,8 +3,8 @@
   gather_facts: no
   tasks:
     - name: Unconditionally shut down the machine
-      raw: poweroff
-      ignore_errors: yes
+      community.general.shutdown:
+        delay: 0
       ignore_unreachable: yes
     - name: Wait for the machine to shutdown
       shell: "until ! ping -c 1 {{ ansible_host }}; do sleep 1; done"