OpenStack rabbitMQ credentials could be used for murano services, but prefered way is to make additional changes into rabbitMQ configuration, like own vhost, login and password. These steps require superuser rights and should be run on the OpenStack controller node where rabbitMQ service resides.
How to do this:
># rabbitmqctl add_user muranouser muranopassword
># rabbitmqctl set_user_tags muranouser administrator
># rabbitmqctl add_vhost muranovhost
># rabbitmqctl set_permissions -p muranovhost muranouser ".*" ".*" ".*"
