Imports github.com/docker/swarmkit/api github.com/docker/swarmkit/log github.com/docker/swarmkit/manager/state github.com/docker/swarmkit/manager/state/store github.com/docker/swarmkit/protobuf/ptypes golang.org/x/net/context github.com/docker/swarmkit/manager/constraint Standard library imports errors fmt sort strings time container/heap container/list