Log exception when doing a remote execution.

        :param string command: shell command to run

        """

        # return stdout and stderr mixed in

        try:

            return Popen(command, shell=True, bufsize=-1, stdin=PIPE, stdout=PIPE,

                         stderr=STDOUT).communicate()[0] or None

        except Exception:

            logger.exception('Error while executing a remote command')

            raise

    def node_shutdown(self, reboot=True, gracefull=True):

        """Halt/Reboot the node.