Test the configuration_utils utility

The existing implementation of configuration_utils was untested, examples
added to test it. A Test helper method 'with_load_path_helper' created to
prepend a path location to the list of load paths for use in examples. This
helper is used by the configuration_utils_spec and the directory_finder_spec.

[#71229700]
Merge branch 'cgfrost-71229700-test_configuration_utils'

[resolves #7]