Fixed bug in view log function for remote computing manager.

    def _get_task_log(self, task, **kwargs):

        # Get computing host

        host = task.computing.get_conf_param('host')

        # Get id_rsa

        # Get user keys

        if task.computing.require_user_keys:

            user_keys = Keys.objects.get(user=task.user, default=True)

            id_rsa_file = user_keys.private_key_file

        else:

            raise NotImplementedError('Remote with no keys not yet')

            raise NotImplementedError('Remote tasks not requiring keys are not yet supported')

        # Get computing host

        host = task.computing.get_conf_param('master')

        user = task.computing.get_conf_param('user')

        # Stop the task remotely

        view_log_command = 'ssh -i {} -4 -o StrictHostKeyChecking=no {}@{} \'/bin/bash -c "cat /tmp/{}.log"\''.format(user_keys.private_key_file, user, host, task.uuid)

        # View the Singularity container log

        view_log_command = 'ssh -i {} -4 -o StrictHostKeyChecking=no {} \'/bin/bash -c "cat /tmp/{}.log"\''.format(id_rsa_file, host, task.uuid)

        logger.debug(view_log_command)

        out = os_shell(view_log_command, capture=True)

        if out.exit_code != 0:

            raise Exception(out.stderr)