Remove a child from current workitem

        :param child_id: the child workitem id/number
            (integer or equivalent string)

def removeChild(self, child_id):
        """Remove a child from current workitem

        :param child_id: the child workitem id/number
            (integer or equivalent string)
        """

        self.log.debug("Try to remove a child <Workitem %s> from current "
                       "<Workitem %s>",
                       child_id,
                       self)
        self._removeChildren([child_id])
        self.log.info("Successfully remove a child <Workitem %s> from "
                      "current <Workitem %s>",
                      child_id,
                      self)