Add datapath service to client

- The datapath service needs to be integrated to the Client
- This commit adds the required fields to the Client structure in order
  to make the datapath service available

Author: Franck Rupin

ovs/client.go

@@ -36,6 +36,9 @@ type Client struct {
 	// VSwitch wraps functionality of the 'ovs-vsctl' binary.
 	VSwitch *VSwitchService
 
+	// DataPath wraps functionality of the 'ovs-dpctl' binary
+	DataPath *DataPathService
+
 	// Additional flags applied to all OVS actions, such as timeouts
 	// or retries.
 	flags []string
@@ -240,6 +243,12 @@ func New(options ...OptionFunc) *Client {
 	}
 	c.App = app
 
+	c.DataPath = &DataPathService{
+		CLI: &OvsCLI{
+			c: c,
+		},
+	}
+
 	return c
 }