Fix netplan file suffix

Change-Id: Ib9ddb0cdc33649d41d82fe4d52a50064cfb3ae5f
diff --git a/playbooks/setup-openstack-iscsi-multipath/pre.yaml b/playbooks/setup-openstack-iscsi-multipath/pre.yaml
index 9bf16f9..a650d40 100644
--- a/playbooks/setup-openstack-iscsi-multipath/pre.yaml
+++ b/playbooks/setup-openstack-iscsi-multipath/pre.yaml
@@ -130,7 +130,7 @@
       become: true
       ansible.builtin.copy:
         content: "{{ storpool_netplan }}"
-        dest: /etc/netplan/60-storpool-iscsi.network
+        dest: /etc/netplan/60-storpool-iscsi.yaml
 
     - name: Generate Netplan
       become: true