Fix plugins stderr output

hptoad.py

@@ -122,8 +122,8 @@ class Zhobe:
 
         try:
             proc = subprocess.Popen(cmd,
-                                    stdin=subprocess.PIPE,
                                     stdout=subprocess.PIPE,
+                                    stderr=subprocess.PIPE,
                                     universal_newlines=True)
             cmd_out, cmd_outerr = proc.communicate()
         except subprocess.CalledProcessError as err: