Grabbed the upstream integration tests and brought them here. Removed bash script. Added validateKubectl.py to /test folder for integration tests.

test/validateKubectl.py

@@ -0,0 +1,31 @@
+import os, sys, json, requests, time
+
+version_to_check = sys.argv[1]
+version_info = None
+PASSED = False
+
+try:
+    print('kubectl version --client -o json')
+    version_info = json.load(os.popen('kubectl version --client -o json'))
+except Exception as ex:
+  sys.exit('kubectl not installed')
+
+try:
+    if version_to_check == 'latest':
+        response = None
+        time_to_sleep = 2
+        for _ in range(10):
+            response = requests.get('https://storage.googleapis.com/kubernetes-release/release/stable.txt')
+            if response.status_code == 200:
+                break
+            print('Failed to obtain latest version info, retrying.')
+            time.sleep(time_to_sleep)
+            time_to_sleep *= 2
+        version_to_check = response.content.decode('utf-8')
+    PASSED = True if version_info['clientVersion']['gitVersion'] == version_to_check else False
+except:
+    pass
+
+if not PASSED:
+    sys.exit('Setting up of '+version_to_check+' kubectl failed')
+print('Test passed')