api/services: update go packages and regenerate

Signed-off-by: Stephen J Day <stephen.day@docker.com>

api/services/version/v1/version.proto

@@ -5,6 +5,9 @@ package containerd.services.version.v1;
 import "google/protobuf/empty.proto";
 import "gogoproto/gogo.proto";
 
+// TODO(stevvooe): Should version service actually be versioned?
+option go_package = "github.com/containerd/containerd/api/services/version/v1;version";
+
 service Version {
 	rpc Version(google.protobuf.Empty) returns (VersionResponse);
 }