Keeping future print for python3 conversion

stretch_core/nodes/keyboard_teleop

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+from __future__ import print_function
 
 import math
 import keyboard as kb

stretch_core/nodes/stretch_driver

@@ -1,4 +1,5 @@
 #! /usr/bin/env python
+from __future__ import print_function
 
 import yaml
 import numpy as np