Make rabbitmq cluster_partition_handling configurable

Change-Id: If2fdab2ae0f981d9fcbb0fea7a92fcde325804f8
(cherry picked from commit c998412)

Author: keuko

ansible/roles/rabbitmq/defaults/main.yml

@@ -74,3 +74,5 @@ rabbitmq_pid_file: "/var/lib/rabbitmq/mnesia/rabbitmq.pid"
 rabbitmq_server_additional_erl_args: ""
 # Dict of TLS options for RabbitMQ. Keys will be prefixed with 'ssl_options.'.
 rabbitmq_tls_options: {}
+# To avoid split-brain
+rabbitmq_cluster_partition_handling: "pause_minority"

ansible/roles/rabbitmq/templates/rabbitmq.conf.j2

@@ -6,8 +6,7 @@ listeners.ssl.1 = {{ api_interface_address }}:{{ role_rabbitmq_port }}
 {% else %}
 listeners.tcp.1 = {{ api_interface_address }}:{{ role_rabbitmq_port }}
 {% endif %}
-{# NOTE: to avoid split-brain #}
-cluster_partition_handling = pause_minority
+cluster_partition_handling = {{ rabbitmq_cluster_partition_handling }}
 
 management.listener.ip = {{ api_interface_address }}
 management.listener.port = {{ role_rabbitmq_management_port }}