remove six in sample; move six back from main requirements into test requirements

Author: xinyzhou

requirements.txt

@@ -17,6 +17,5 @@ azure-cognitiveservices-vision-customvision>=0.4.0  # sample won't work with pre
 azure-cognitiveservices-vision-face
 azure-cognitiveservices-anomalydetector>=0.2.0 #  sample won't work with previous versions
 azure-cognitiveservices-inkrecognizer>=1.0.0
-six>=1.6
 wxpython>=4.0.6
 pandas

samples/vision/inkrecognizer_tkinter_sample.py

@@ -1,11 +1,12 @@
 import os
-import six
-if six.PY2:
-    from Tkinter import *
-    import tkMessageBox as messagebox
-else:
+try:
     from tkinter import *
     from tkinter import messagebox
+except ImportError:
+    # python <= 2.7
+    from Tkinter import *
+    import tkMessageBox as messagebox
+
 from collections import namedtuple
 from azure.cognitiveservices.inkrecognizer import ApplicationKind, InkStrokeKind
 from azure.cognitiveservices.inkrecognizer import InkRecognizerClient

tests/test-requirements.txt

@@ -2,4 +2,5 @@
 
 azure-devtools
 mock;python_version<="2.7"
-nose
+nose
+six