base: Use stable sorting in firewall templates

roles/base/templates/firewall/03allow-cluster

@@ -4,10 +4,10 @@
 create_chain allow-cluster
 {% for host in groups['all']|sort %}
 # {{ host }}
-{% for addr in hostvars[host]['ansible_all_ipv4_addresses'] %}
+{% for addr in hostvars[host]['ansible_all_ipv4_addresses'] | sort %}
 add_rule4 -A allow-cluster -s {{ addr }} -j ACCEPT
 {% endfor %}
-{% for addr in hostvars[host]['ansible_all_ipv6_addresses'] %}
+{% for addr in hostvars[host]['ansible_all_ipv6_addresses'] | sort %}
 {% if not addr.startswith('fe80::') %}
 add_rule6 -A allow-cluster -s {{ addr }} -j ACCEPT
 {% endif %}