configparser.ConfigParser attempts to interpolate "%" characters in the
values of the key-value pairs when parsing. This is absolutely unwanted
behavior, especially when parsing URLs such as
<sourceforge url>/joe-editor/files/JOE%20sources/<joe tar>
which cause an uncaught exception.
Turn off interpolation by passing the interpolation=None argument to
ConfigParser.
Add a unit tests to report when ConfigParser(...) is called in the
codebase without setting interpolation to None.
Signed-off-by: Matthew Johnson <matthew.johnson@intel.com>