Comment 5 for bug 1842408

Confirmed that with /etc/rabbit owned by rabbitmq:rabbitmq, rabbitmq-plugins is able to enable/disable plugins when run as user rabbitmq:

# chsh rabbitmq /bin/bash
# chown -R rabbitmq:rabbitmq /etc/rabbitmq/
# su rabbitmq
rabbitmq@review-eoan:/var/log$ rabbitmq-plugins enable --all
The following plugins have been configured:
  rabbitmq_amqp1_0
  rabbitmq_auth_backend_cache
  ..
rabbitmq@review-eoan:/var/log$ rabbitmq-plugins disable --all
All plugins have been disabled.
Applying plugin configuration to rabbit@review-eoan...
The following plugins have been disabled:
  rabbitmq_recent_history_exchange
  rabbitmq_management_agent
  ..