feat(): Add wireguard backend to flannel cni

As described in the flannel docs:
https://github.com/flannel-io/flannel/blob/master/Documentation/backends.md#wireguard

This does not support optional configuration methods like:
- setting a psk (will be autogenerated by default)
- chang listening ports
- change mode (defaults to 'separate')
- change PersistentKeepaliveInterval (defaults to 0)

inventory/sample/group_vars/k8s_cluster/k8s-net-flannel.yml

@@ -10,8 +10,7 @@
 ## single quote and escape backslashes
 # flannel_interface_regexp: '10\\.0\\.[0-2]\\.\\d{1,3}'
 
-# You can choose what type of flannel backend to use: 'vxlan' or 'host-gw'
-# for experimental backend
+# You can choose what type of flannel backend to use: 'vxlan',  'host-gw' or 'wireguard'
 # please refer to flannel's docs : https://github.com/coreos/flannel/blob/master/README.md
 # flannel_backend_type: "vxlan"
 # flannel_vxlan_vni: 1

roles/network_plugin/flannel/tasks/main.yml

@@ -1,4 +1,13 @@
 ---
+
+- name: Flannel | Stop if kernel version is too low for Flannel Wireguard encryption
+  assert:
+    that: ansible_kernel.split('-')[0] is version('5.6.0', '>=')
+  when:
+    - kube_network_plugin == 'flannel'
+    - flannel_backend_type == 'wireguard'
+    - not ignore_assert_errors
+
 - name: Flannel | Create Flannel manifests
   template:
     src: "{{ item.file }}.j2"