common: do not use `shell` module when it is not needed

There is no need here to use `shell` instead of `command`

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

infrastructure-playbooks/purge-cluster.yml

@@ -294,7 +294,9 @@
     ignore_errors: true
 
   - name: is reboot needed
-    local_action: shell echo requesting reboot
+    local_action:
+      module: command
+        echo requesting reboot
     become: false
     notify:
       - restart machine
@@ -569,7 +571,9 @@
      state: absent
 
   - name: request data removal
-    local_action: shell echo requesting data removal
+    local_action:
+      module: command
+        echo requesting data removal
     become: false
     notify:
       - remove data

roles/ceph-common/tasks/checks/check_firewall.yml

@@ -1,6 +1,8 @@
 ---
 - name: check if nmap is installed
-  local_action: shell command -v nmap
+  local_action:
+    module: command
+      command -v nmap
   changed_when: false
   failed_when: false
   register: nmapexist