Add a restart playbook
Add a restart playbook

Add a playbook that will restart the entire zuul world. This hasn't been
tested in production, but I think it's a good idea to start and improve
it as we go.

Signed-off-by: Jamie Lennox <1b9801e8e46f6bd96338b24e58c84c4f37762fc2@gmail.com>

jamielennox/hoist,SpamapS/hoist,BonnyCI/hoist,BonnyCI/hoist,jamielennox/hoist,SpamapS/hoist