Move cilium_deploy_additionnaly to kubespray-default (#12191)

Instead of using default(false) all over the place, use
kubespray-defaults

roles/kubespray-defaults/defaults/main/download.yml

@@ -632,7 +632,7 @@ downloads:
       - kube_control_plane
 
   cilium:
-    enabled: "{{ kube_network_plugin == 'cilium' or cilium_deploy_additionally | default(false) | bool }}"
+    enabled: "{{ kube_network_plugin == 'cilium' or cilium_deploy_additionally }}"
     container: true
     repo: "{{ cilium_image_repo }}"
     tag: "{{ cilium_image_tag }}"
@@ -641,7 +641,7 @@ downloads:
       - k8s_cluster
 
   cilium_operator:
-    enabled: "{{ kube_network_plugin == 'cilium' or cilium_deploy_additionally | default(false) | bool }}"
+    enabled: "{{ kube_network_plugin == 'cilium' or cilium_deploy_additionally }}"
     container: true
     repo: "{{ cilium_operator_image_repo }}"
     tag: "{{ cilium_operator_image_tag }}"
@@ -695,7 +695,7 @@ downloads:
       - k8s_cluster
 
   ciliumcli:
-    enabled: "{{ kube_network_plugin == 'cilium' or cilium_deploy_additionally | default(false) | bool }}"
+    enabled: "{{ kube_network_plugin == 'cilium' or cilium_deploy_additionally }}"
     file: true
     dest: "{{ local_release_dir }}/cilium-{{ cilium_cli_version }}-{{ image_arch }}.tar.gz"
     checksum: "{{ ciliumcli_binary_checksum }}"

roles/kubespray-defaults/defaults/main/main.yml

@@ -204,6 +204,12 @@ kube_log_level: 2
 kube_network_plugin: calico
 kube_network_plugin_multus: false
 
+## Network plugin options with dependencies across the whole playbook
+
+# Deploy cilium even if kube_network_plugin is not cilium.
+# This enables to deploy cilium alongside another CNI to replace kube-proxy.
+cilium_deploy_additionally: false
+
 # Determines if calico_rr group exists
 peer_with_calico_rr: "{{ 'calico_rr' in groups and groups['calico_rr'] | length > 0 }}"