Move engine-api client package

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

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

service_create.go

@@ -0,0 +1,30 @@
+package client
+
+import (
+	"encoding/json"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/swarm"
+	"golang.org/x/net/context"
+)
+
+// ServiceCreate creates a new Service.
+func (cli *Client) ServiceCreate(ctx context.Context, service swarm.ServiceSpec, options types.ServiceCreateOptions) (types.ServiceCreateResponse, error) {
+	var headers map[string][]string
+
+	if options.EncodedRegistryAuth != "" {
+		headers = map[string][]string{
+			"X-Registry-Auth": {options.EncodedRegistryAuth},
+		}
+	}
+
+	var response types.ServiceCreateResponse
+	resp, err := cli.post(ctx, "/services/create", nil, service, headers)
+	if err != nil {
+		return response, err
+	}
+
+	err = json.NewDecoder(resp.body).Decode(&response)
+	ensureReaderClosed(resp)
+	return response, err
+}