test: only suppress starttask.sh output and not sudo

the remote support logic uses sudo output in tests

src/tasks.js

@@ -45,8 +45,10 @@ exports = module.exports = {
 
 const assert = require('assert'),
     BoxError = require('./boxerror.js'),
+    constants = require('./constants.js'),
     database = require('./database.js'),
     debug = require('debug')('box:tasks'),
+    fs = require('fs'),
     logs = require('./logs.js'),
     path = require('path'),
     paths = require('./paths.js'),
@@ -167,7 +169,9 @@ function startTask(id, options, callback) {
 
     let killTimerId = null, timedOut = false;
 
-    gTasks[id] = shell.sudo('startTask', [ START_TASK_CMD, id, logFile, options.nice || 0, options.memoryLimit || 400 ], { preserveEnv: true }, async function (sudoError) {
+    const sudoOptions = { preserveEnv: true, logStream: null };
+    if (constants.TEST) sudoOptions.logStream = fs.createWriteStream('/dev/null'); // without this output is messed up, not sure why
+    gTasks[id] = shell.sudo('startTask', [ START_TASK_CMD, id, logFile, options.nice || 0, options.memoryLimit || 400 ], sudoOptions, async function (sudoError) {
         if (!gTasks[id]) return; // ignore task exit since we are shutting down. see stopAllTasks
 
         const code = sudoError ? sudoError.code : 0;