update storageos vendor for FilteredDial change

vendor/github.com/storageos/go-api/cluster.go

@@ -0,0 +1,48 @@
+package storageos
+
+import (
+	"encoding/json"
+
+	"github.com/storageos/go-api/types"
+)
+
+var (
+	// ClusterMaintenanceAPIPrefix is a path to the HTTP endpoint for managing
+	// the cluster maintenance mode.
+	ClusterMaintenanceAPIPrefix = "cluster/maintenance"
+)
+
+// Maintenance returns the maintenance status of the cluster
+func (c *Client) Maintenance() (*types.Maintenance, error) {
+	resp, err := c.do("GET", ClusterMaintenanceAPIPrefix, doOptions{})
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	res := &types.Maintenance{}
+	if err := json.NewDecoder(resp.Body).Decode(res); err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+// EnableMaintenance enables maintenance mode in the cluster
+func (c *Client) EnableMaintenance() error {
+	resp, err := c.do("POST", ClusterMaintenanceAPIPrefix, doOptions{})
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	return nil
+}
+
+// DisableMaintenance disables maintenance mode in the cluster
+func (c *Client) DisableMaintenance() error {
+	resp, err := c.do("DELETE", ClusterMaintenanceAPIPrefix, doOptions{})
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	return nil
+}