Stores a password in a keychain for a particular environment and
    configuration parameter pair.

def password_set(username=None, password=None):
    """
    Stores a password in a keychain for a particular environment and
    configuration parameter pair.
    """
    result = keyring.set_password('supernova', username, password)

    # NOTE: keyring returns None when the storage is successful.  That's weird.
    if result is None:
        return True
    else:
        return False