4.0.x: upgrade Redbug to 2.1.0#12484

michaelklishin merged 3 commits intov4.0.xrabbitmq/rabbitmq-server:v4.0.xfrom

su_aws/update_dependency_redbug-for-v4.0.xrabbitmq/rabbitmq-server:su_aws/update_dependency_redbug-for-v4.0.xCopy head branch name to clipboard