Go system tests: Sets the environment variable GODEBUG=cgocheck=2.

mojo/tools/mojob.py

Index: mojo/tools/mojob.py
diff --git a/mojo/tools/mojob.py b/mojo/tools/mojob.py
index ee0c871de7e13154a3c6e89711bbf417b2adea61..b0f4fe0ad0203df5804be395603521d091c8f696 100755
--- a/mojo/tools/mojob.py
+++ b/mojo/tools/mojob.py
@@ -185,7 +185,10 @@ def _run_tests(config, test_types):
       continue
 
     _logger.info('Starting: %s' % ' '.join(entry['command']))
-    exit_code = subprocess.call(entry['command'])
+    env = os.environ
+    if 'env' in entry and entry['env'] is not None:
+      env.update(entry['env'])
+    exit_code = subprocess.call(entry['command'], env=env)
     _logger.info('Completed: %s' % ' '.join(entry['command']))
     if exit_code:
       if not final_exit_code: