Updates swarmkit to 33d06bf5189881b4d1e371b5571f4d3acf832816, to bring in
docker/swarmkit#2610 (Don't use wrappers for grpc metadata)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Update swarmkit to 037b491.
As swarmkit switched to a newer gRPC version, this also involves
updating Docker's vendored gRPC, which in turn requires updating
containerd to a new version that has protobufs generated against this
gRPC version.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
