Ensure apparmor is installed (#8011)

Kubespray deployment failed when using containerd backend on nodes that apparmor was not installed or previously removed. This PR ensure apparmor is installed by adding it into required_pkgs var.

roles/kubernetes/preinstall/vars/debian-11.yml

@@ -6,3 +6,4 @@ required_pkgs:
   - software-properties-common
   - conntrack
   - iptables
+  - apparmor

roles/kubernetes/preinstall/vars/debian.yml

@@ -5,3 +5,4 @@ required_pkgs:
   - apt-transport-https
   - software-properties-common
   - conntrack
+  - apparmor