Update autotest tests to use make -j where possible.

client/bin/unit_test.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 logging, os
 
 from autotest_lib.client.bin import test
 from autotest_lib.client.common_lib import utils
 
 class unit_test(test.test):
     """
     Unit test should simply subclass this test which handles everything.
     """
     version = 1
     preserve_srcdir = True
 
 
     def setup(self):
       os.chdir(self.srcdir)
-      utils.system('make clean')
-      utils.system('make all')
+      utils.make('clean')
+      utils.make('all')
       
       self.job.setup_dep(['gtest'])
 
     def run_once(self):
         dep ='gtest'
         dep_dir = os.path.join(self.autodir, 'deps', dep)
         self.job.install_pkg(dep, 'dep', dep_dir)
       
         # Run the unit test, gather the results and place the gcda files for
         # code coverage in the results directory.
         
         os.chdir(self.srcdir)
         result = utils.run('LD_LIBRARY_PATH=' + dep_dir + 
                            ' GCOV_PREFIX=' + self.resultsdir +
                            ' GCOV_PREFIX_STRIP=9999 ./unit_test > ' +
                            self.resultsdir + '/unit_test_result.txt')
         logging.debug(result.stderr)
         logging.info('result: ' + self.resultsdir + '/unit_test_result.txt')
         
     def cleanup(self):
         # This is a hack - we should only need to copy back the .gcda file but
         # we don't know how to access the source on the server. So copy 
         # everything back.
         
         os.chdir(self.srcdir)
         utils.run('cp * ' + self.resultsdir)