Move engine-api client package

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

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

client/container_wait.go

@@ -0,0 +1,26 @@
+package client
+
+import (
+	"encoding/json"
+
+	"golang.org/x/net/context"
+
+	"github.com/docker/docker/api/types"
+)
+
+// ContainerWait pauses execution until a container exits.
+// It returns the API status code as response of its readiness.
+func (cli *Client) ContainerWait(ctx context.Context, containerID string) (int, error) {
+	resp, err := cli.post(ctx, "/containers/"+containerID+"/wait", nil, nil, nil)
+	if err != nil {
+		return -1, err
+	}
+	defer ensureReaderClosed(resp)
+
+	var res types.ContainerWaitResponse
+	if err := json.NewDecoder(resp.body).Decode(&res); err != nil {
+		return -1, err
+	}
+
+	return res.StatusCode, nil
+}