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_top.go

@@ -0,0 +1,28 @@
+package client
+
+import (
+	"encoding/json"
+	"net/url"
+	"strings"
+
+	"github.com/docker/docker/api/types"
+	"golang.org/x/net/context"
+)
+
+// ContainerTop shows process information from within a container.
+func (cli *Client) ContainerTop(ctx context.Context, containerID string, arguments []string) (types.ContainerProcessList, error) {
+	var response types.ContainerProcessList
+	query := url.Values{}
+	if len(arguments) > 0 {
+		query.Set("ps_args", strings.Join(arguments, " "))
+	}
+
+	resp, err := cli.get(ctx, "/containers/"+containerID+"/top", query, nil)
+	if err != nil {
+		return response, err
+	}
+
+	err = json.NewDecoder(resp.body).Decode(&response)
+	ensureReaderClosed(resp)
+	return response, err
+}