sudo: remove the nice support

src/shell.js

@@ -14,7 +14,6 @@ var assert = require('assert'),
     util = require('util');
 
 const SUDO = '/usr/bin/sudo';
-const NICE = '/usr/bin/nice';
 
 function exec(tag, cmd, callback) {
     assert.strictEqual(typeof tag, 'string');
@@ -42,11 +41,6 @@ function spawn(tag, file, args, options, callback) {
 
     if (options.ipc) options.stdio = ['pipe', 'pipe', 'pipe', 'ipc'];
 
-    if (options.nice) {
-        args = ['-n', options.nice, file].concat(args);
-        file = NICE;
-    }
-
     debug(tag + ' spawn: %s %s', file, args.join(' '));
     const cp = child_process.spawn(file, args, options);