Fix reporting or errors addin building and testing

visual_studio/NativeClientVSAddIn/buildbot_run.py

Index: visual_studio/NativeClientVSAddIn/buildbot_run.py
diff --git a/visual_studio/NativeClientVSAddIn/buildbot_run.py b/visual_studio/NativeClientVSAddIn/buildbot_run.py
index 6876c01e1bb787b0c25de43e3c55d513f61fb901..6a5955c14f7a14c491354de34fd0fe2151764c9a 100644
--- a/visual_studio/NativeClientVSAddIn/buildbot_run.py
+++ b/visual_studio/NativeClientVSAddIn/buildbot_run.py
@@ -34,10 +34,11 @@ def RunCommand(cmd, env=None):
     # allow bat files in the current working directory to
     # be executed on cygwin as they are on win32
     if not os.path.dirname(cmd[0]) and os.path.exists(cmd[0]):
-      cmd = './' + cmd
+      cmd[0] = './' + cmd[0]
 
-  rtn = subprocess.call(cmd, shell=True, env=env)
+  rtn = subprocess.call(cmd, env=env)
   if rtn:
+    Log("Command returned non-zero exit code: %s" % rtn)
     Log('@@@STEP_FAILURE@@@')
     sys.exit(1)