Delete  device attribute properties from database

        :param argin: Str[0] = Device name
        Str[1] = Attribute name
        :type: tango.DevVarStringArray
        :return:
        :rtype: tango.DevVoid

def DbDeleteDeviceAttribute(self, argin):
        """ Delete  device attribute properties from database

        :param argin: Str[0] = Device name
        Str[1] = Attribute name
        :type: tango.DevVarStringArray
        :return:
        :rtype: tango.DevVoid """
        self._log.debug("In DbDeleteDeviceAttribute()")

        if len(argin) < 2:
            self.warn_stream("DataBase::db_delete_device_attribute(): insufficient number of arguments ")
            th_exc(DB_IncorrectArguments,
                   "insufficient number of arguments to delete device attribute",
                   "DataBase::DeleteDeviceAttribute()")

        dev_name, attr_name = argin[:2]

        ret, dev_name, dfm = check_device_name(argin)
        if not ret:
            self.warn_stream("DataBase::db_delete_device_attribute(): device name " + argin + " incorrect ")
            th_exc(DB_IncorrectDeviceName,
                   "failed to delete device attribute, device name incorrect",
                   "DataBase::DeleteDeviceAttribute()")

        self.db.delete_device_attribute(dev_name, attr_name)