restart: Instance -> Slot
restart: Instance -> Slot

Signed-off-by: Aaron Lehmann <8ecfc6017a87905413dcd7d63696a2a4c351b604@docker.com>

sungwonh/swarmkit,jlhawn/swarmkit,jlhawn/swarmkit,dperny/swarmkit-1,dperny/swarmkit-1,docker/swarmkit,cheyang/swarmkit,alyyousuf7/swarmkit,cheyang/swarmkit,docker/swarmkit,alyyousuf7/swarmkit,AliyunContainerService/swarmkit,AliyunContainerService/swarmkit,sungwonh/swarmkit