docs: def delete_role(role_id,**kwargs):
      """
          Delete a role
      """
      #check_perm(kwargs.get('user_id'), 'edit_role')
      try:
          role_i = db.DBSession.query(Role).filter(Role.id==role_id).one()
          db.DBSession.delete(role_i)
      except InvalidRequestError:
          raise ResourceNotFoundError("Role (role_id=%s) does not exist"%(role_id))
  
      return 'OK'