vendoring dependencies

vendor/github.com/docker/engine-api/client/checkpoint_delete.go

@@ -0,0 +1,12 @@
+package client
+
+import (
+	"golang.org/x/net/context"
+)
+
+// CheckpointDelete deletes the checkpoint with the given name from the given container
+func (cli *Client) CheckpointDelete(ctx context.Context, containerID string, checkpointID string) error {
+	resp, err := cli.delete(ctx, "/containers/"+containerID+"/checkpoints/"+checkpointID, nil, nil)
+	ensureReaderClosed(resp)
+	return err
+}