Increase the idx counter

Fix the idx counter to increase too, or you will end up with two same indexes.

roles/kubernetes/secrets/templates/openssl.conf.j2

@@ -27,6 +27,7 @@ IP.{{ 2 * loop.index }} = {{ hostvars[host]['ip'] | default(hostvars[host]['ansi
 IP.{{ idx }} = {{ kube_apiserver_ip }}
 {% if loadbalancer_apiserver is defined  %}
 IP.{{ idx + 1 }} = {{ loadbalancer_apiserver.address }}
+{% set idx = idx + 1 %}
 {% endif %}
 IP.{{ idx + 1 }} = 127.0.0.1
 {% if supplementary_addresses_in_ssl_keys is defined %}