docs: def guest_delete(self, userid):
          """Delete guest.
  
          :param userid: the user id of the vm
          """
  
          # check guest exist in database or not
          userid = userid.upper()
          if not self._vmops.check_guests_exist_in_db(userid, raise_exc=False):
              if zvmutils.check_userid_exist(userid):
                  LOG.error("Guest '%s' does not exist in guests database" %
                            userid)
                  raise exception.SDKObjectNotExistError(
                      obj_desc=("Guest '%s'" % userid), modID='guest')
              else:
                  LOG.debug("The guest %s does not exist." % userid)
                  return
  
          action = "delete guest '%s'" % userid
          with zvmutils.log_and_reraise_sdkbase_error(action):
              return self._vmops.delete_vm(userid)