Update autotest tests to use make -j where possible.

client/site_tests/logging_UserCrash/logging_UserCrash.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 grp, logging, os, pwd, re, stat, subprocess
 from signal import SIGSEGV
 from autotest_lib.client.bin import site_crash_test, site_utils, test
 from autotest_lib.client.common_lib import error, utils
 
 _CORE_PATTERN = '/proc/sys/kernel/core_pattern'
 _LEAVE_CORE_PATH = '/etc/leave_core'
 
 
 class logging_UserCrash(site_crash_test.CrashTest):
     version = 1
 
 
     def setup(self):
         os.chdir(self.srcdir)
-        utils.system('make clean all')
+        utils.make('clean all')
 
 
     def _test_reporter_startup(self):
         """Test that the core_pattern is set up by crash reporter."""
         output = utils.read_file(_CORE_PATTERN).rstrip()
         expected_core_pattern = ('|%s --signal=%%s --pid=%%p' %
                                  self._CRASH_REPORTER_PATH)
         if output != expected_core_pattern:
             raise error.TestFail('core pattern should have been %s, not %s' %
                                  (expected_core_pattern, output))
@@ skipping 373 matching lines @@
             'reporter_startup',
             'reporter_shutdown',
             'no_crash',
             'chronos_breakpad_crasher',
             'chronos_nobreakpad_crasher',
             'root_breakpad_crasher',
             'root_nobreakpad_crasher',
             'core_file_removed_in_production',
             'core_file_persists_in_debug',
             ])