Fix for travis build failure due to Python 3.5 specific code.

tests/testUtils.py

@@ -418,8 +418,9 @@ class Node(object):
                 retMap["returncode"]=ex.returncode
                 retMap["cmd"]=ex.cmd
                 retMap["output"]=ex.output
-                retMap["stdout"]=ex.stdout
-                retMap["stderr"]=ex.stderr
+                # commented below as they are available only in Python3.5 and above
+                # retMap["stdout"]=ex.stdout
+                # retMap["stderr"]=ex.stderr
                 return retMap
 
         if shouldFail: