Update autotest tests to use make -j where possible.

client/site_tests/audiovideo_PlaybackRecordSemiAuto/audiovideo_PlaybackRecordSemiAuto.py

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import copy, logging, os, pprint, re, threading, time, urllib
 
 from autotest_lib.client.bin import site_ui_test
 from autotest_lib.client.common_lib import error, site_httpd, site_ui, utils
 
 # HTML templates.
@@ skipping 273 matching lines @@
         Wrap a shell command within the necessary environment setup to get
         access to the PulseAudio daemon.
         """
         cmd = 'su chronos -c "%s"' % cmd
         cmd = 'PULSE_RUNTIME_PATH=/var/run/pulse ' + cmd
         return cmd
 
 
     def setup(self):
         os.chdir(self.srcdir)
-        utils.system('make clean')
-        utils.system('make')
+        utils.make('clean')
+        utils.make()
 
 
     def initialize(self, creds = '$default'):
         self._playback_devices = self.enumerate_playback_devices()
         self._record_devices = self.enumerate_record_devices()
         self._test_tones_path = os.path.join(self.srcdir, "test_tones")
         if not (os.path.exists(self._test_tones_path) and
                 os.access(self._test_tones_path, os.X_OK)):
             raise error.TestError(
                     '%s is not an executable' % self._test_tones_path)
@@ skipping 936 matching lines @@
         cmd = ('%(exec)s '
                '-t %(type)s -h %(frequency)f -l %(tone_length_sec)f '
                '-c %(channels)d' % args)
         if args['active_channel'] is not None:
             cmd += ' -a %s' % args['active_channel']
         if args['type'] == 'tone':
             logging.info('[tone %dHz]' % args['frequency'])
         elif args['type'] == 'scale':
             logging.info('[A# harmonic minor scale]')
         utils.system(self.pacmd(cmd))