RabbitMQ nodes is not equal to number of cluster nodes after add/delete controller nodes

Steps to reproduce:
        Scenario:
            1. Create cluster
            2. Add 1 controller node
            3. Deploy the cluster
            4. Add 2 controller nodes
            5. Deploy changes
            6. Add 2 controller 1 compute nodes
            7. Deploy changes
            8. Run OSTF
            9. Delete the primary and the last added controller.
            10. Deploy changes
            11. Run OSTF

Observed behaviour:
Failed OSTF test:
  - RabbitMQ availability (failure) Number of RabbitMQ nodes is not equal to number of cluster nodes.

Were affected several jobs:
https://patching-ci.infra.mirantis.net/job/8.0.system_test.ubuntu.ha_neutron_tun_scale/74/testReport/(root)/neutron_tun_scalability/neutron_tun_scalability/
https://patching-ci.infra.mirantis.net/job/8.0.system_test.ubuntu.plugins.thread_2_separate_services/72/testReport/(root)/separate_rabbit_service_add_delete_node/separate_rabbit_service_add_delete_node/

Related bug: https://bugs.launchpad.net/mos/+bug/1653722