code: func (p ProvisionTokenV1) String() string {
  	expires := "never"
  	if p.Expires.Unix() != 0 {
  		expires = p.Expires.String()
  	}
  	return fmt.Sprintf("ProvisionToken(Roles=%v, Expires=%v)",
  		p.Roles, expires)
  }
docs: // String returns the human readable representation of a provisioning token.