def grant_roles(user, roles, options = nil)
      policy = create_policy(options, AdminPolicy, default_admin_policy)
      command = AdminCommand.new
      command.grant_roles(@cluster, policy, user, roles)
    end
def grant_roles(user, roles, options = nil)
      policy = create_policy(options, AdminPolicy, default_admin_policy)
      command = AdminCommand.new
      command.grant_roles(@cluster, policy, user, roles)
    end
Add roles to user's list of roles.