Add support for swarm init lock and swarm unlock

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

command/swarm/unlock.go

@@ -0,0 +1,35 @@
+package swarm
+
+import (
+	"context"
+
+	"github.com/spf13/cobra"
+
+	"github.com/docker/docker/api/types/swarm"
+	"github.com/docker/docker/cli"
+	"github.com/docker/docker/cli/command"
+)
+
+func newUnlockCommand(dockerCli *command.DockerCli) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "unlock",
+		Short: "Unlock swarm",
+		Args:  cli.ExactArgs(0),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			client := dockerCli.Client()
+			ctx := context.Background()
+
+			key, err := readKey(dockerCli.In(), "Please enter unlock key: ")
+			if err != nil {
+				return err
+			}
+			req := swarm.UnlockRequest{
+				LockKey: string(key),
+			}
+
+			return client.SwarmUnlock(ctx, req)
+		},
+	}
+
+	return cmd
+}