Stop deleting-and-creating RabbitMQ account on deploy

The `force` option creates and recreates the user which means on
any deploy it kills *all* AMQP traffic on all agents.

This updates it you use `update_password` which instead will just
update the password every single run, which shouldn't kill the
connectivity when we run playbooks.

Change-Id: I1878f702022872190952604caff640bfe6c2ccc1

sync/tasks/mq_setup.yml

@@ -37,12 +37,12 @@
       rabbitmq_user:
         user: "{{ _oslomsg_rpc_userid }}"
         password: "{{ _oslomsg_rpc_password }}"
+        update_password: always
         vhost: "{{ _oslomsg_rpc_vhost }}"
         configure_priv: ".*"
         read_priv: ".*"
         write_priv: ".*"
         state: "present"
-        force: true
       no_log: true
 
 - name: Setup Notify MQ Service (RabbitMQ)