Move engine-api client package

This moves the engine-api client package to `/docker/docker/client`.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

container_start.go

@@ -0,0 +1,21 @@
+package client
+
+import (
+	"net/url"
+
+	"golang.org/x/net/context"
+
+	"github.com/docker/docker/api/types"
+)
+
+// ContainerStart sends a request to the docker daemon to start a container.
+func (cli *Client) ContainerStart(ctx context.Context, containerID string, options types.ContainerStartOptions) error {
+	query := url.Values{}
+	if len(options.CheckpointID) != 0 {
+		query.Set("checkpoint", options.CheckpointID)
+	}
+
+	resp, err := cli.post(ctx, "/containers/"+containerID+"/start", query, nil, nil)
+	ensureReaderClosed(resp)
+	return err
+}