Handle bytes string for Python 3

Author: dmyerscough

config/kube_config.py

@@ -241,9 +241,14 @@ def _load_oid_token(self):
         if len(parts) != 3:  # Not a valid JWT
             return None
 
-        jwt_attributes = json.loads(
-            base64.b64decode(parts[1])
-        )
+        if PY3:
+            jwt_attributes = json.loads(
+                base64.b64decode(parts[1]).decode('utf-8')
+            )
+        else:
+            jwt_attributes = json.loads(
+                base64.b64decode(parts[1])
+            )
 
         expire = jwt_attributes.get('exp')