Updating config_parse.py to work with both Python 2 and 3

This makes the Grunt tasks work no matter if ``python`` refers to Python2 or Python3 on a given system.

* Py2's ``ConfigParser`` is called ``configparser`` in Py3 - a try/except block is used to import the correct module.

* Py3 doesn't allow Py2's "non-function" style of ``print`` statement, so it has been cast in the "function" style.