If, using the API, a user submits an init request with a spec that has a name other than "default", the engine will rename the "default" cluster object. Some parts of swarmkit depend on having a cluster object named "default". Reject any specs that use other names. Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com> Upstream-commit: 9dba9e3248f8476d15242ce3ec0bf6d6d50c1a76 Component: engine