Fix rabbitmq-env.conf ownership in bifrost

The permissions of rabbitmq-env.conf for bifrost were changed in
I6e32d94d4172dd96d09d8609e8a5221ab5586a31 to 0660. This breaks bifrost
deployment, as the rabbitmq user is no longer able to read the
root-owned file on startup.

This commit changes the ownership of the file in the container to
rabbitmq:rabbitmq after it has been copied.

Change-Id: I53418f5d4e40b7ca57e546e2e92a57f613fd381e
Closes-Bug: #1766196

ansible/roles/bifrost/tasks/bootstrap.yml

@@ -17,6 +17,7 @@
      docker exec bifrost_deploy
      bash -c '/bifrost/scripts/env-setup.sh && source /bifrost/env-vars
      && cp /etc/bifrost/rabbitmq-env.conf /etc/rabbitmq/rabbitmq-env.conf &&
+     chown rabbitmq:rabbitmq /etc/rabbitmq/rabbitmq-env.conf &&
      ansible-playbook -vvvv -i /bifrost/playbooks/inventory/target
      /bifrost/playbooks/install.yaml -e @/etc/bifrost/bifrost.yml
      -e @/etc/bifrost/dib.yml -e  skip_package_install=true'