nfs server: install also iptables on the node

The iptables package on the target node is required by the
ansible.builtin.iptables module.
On EL9 iptables does not exist but it is provided by iptables-nft,
but keep iptables for now.

playbooks/nfs.yml

@@ -23,9 +23,11 @@
         - not cifmw_edpm_deploy_nfs | default('false') | bool
       ansible.builtin.meta: end_play
   tasks:
-    - name: Install nfs-utils package
+    - name: Install required packages
       ansible.builtin.package:
-        name: "nfs-utils"
+        name:
+          - nfs-utils
+          - iptables
 
     - name: Configure nfs to use v4 only
       community.general.ini_file: