Use six.moves.configparser instead of ConfigParser

The ConfigParser module has been renamed to configparser in Python 3.
See http://docs.python.org/2/library/configparser.html

Implements: blueprint make-python3-compatible
Change-Id: I13cfd5e90f1b5d342b2f3ef6dd0d246c4fda6156
Merge "Use six.moves.configparser instead of ConfigParser"