Get progress information from an existing job: - uuid - String, the Job's UUID. - callback - f(err, info)
function getInfo(uuid, meta, callback) {
            if (typeof (meta) === 'function') {
                callback = meta;
                meta = {};
            }

            if (!jobs[uuid]) {
                return callback(new e.BackendResourceNotFoundError(
                  'Job does not exist. Cannot get info.'));
            } else {
                if (!util.isArray(jobs[uuid].info)) {
                    jobs[uuid].info = [];
                }
                return callback(null, clone(jobs[uuid].info));
            }
        }