def guest_reboot(self, userid):
        """Reboot a virtual machine
        :param str userid: the id of the virtual machine to be reboot
        :returns: None
        """
        action = "reboot guest '%s'" % userid
        with zvmutils.log_and_reraise_sdkbase_error(action):
            self._vmops.guest_reboot(userid)
Reboot a virtual machine
        :param str userid: the id of the virtual machine to be reboot
        :returns: None