k3s_server: add kube_vip_arp parameter

With the kube_vip_arp parameter it is possible to set or unset the
vip_arp environment variable of the kube-vip-ds daemonset. The value of
the kube_vip_arp is true by default to not change the existing default.

Signed-off-by: Christian Berendt <berendt@osism.tech>

roles/k3s_server/templates/vip.yaml.j2

@@ -27,7 +27,7 @@ spec:
         - manager
         env:
         - name: vip_arp
-          value: "true"
+          value: "{{ 'true' if kube_vip_arp | bool else 'false' }}"
         - name: port
           value: "6443"
 {% if kube_vip_iface %}