/usr/lib/rabbitmq/bin/rabbitmqctl is in rabbitmq-server 3.3.5-1.1+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/rabbitmq/bin/../lib/rabbitmq_server-3.3.5/sbin/rabbitmqctl
/usr/lib/rabbitmq/bin/../lib/rabbitmq_server-3.3.5/sbin/rabbitmqctl