When reconnecting to a RabbitMQ cluster
with mirrored queues in use, the attempt to release the
connection can hang "indefinitely" somewhere deep down
in Kombu. Blocking the thread for a bit prior to
release seems to kludge around the problem where it is
The value 5.0 fits for low perfomance environments as well.
Cherry-picked from Oslo.messaging:
Signed-off-by: Bogdan Dobrelya <firstname.lastname@example.org>