python: Use the print function

python: Use the print function

In Python 2, `print` was a statement, but it became a function in
Python 3.

Using print functions everywhere makes the script compatible with Python
versions >= 2.6, including Python 3.

Signed-off-by: Mathieu Bridon <bochecha@daitauha.fr>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>
Acked-by: Dylan Baker <dylan@pnwbakers.com>