Docker-compose exec allocates a tty by default unlike docker exec. New
Ansible doesn't provision a tty which causes docker-compose exec to fail
under Ansible now. Address this by passing -T to docker-compose exec
commands which stops allocating a tty. We didn't need one to gracefully
stop zuul services.
Change-Id: Ib52f184f771ae4530f6b6531257dda5d8443043c
46ba1ff961