Override the default authentication credentials obtained from the
    environment variable configuration.

    :param str username: The username to use
    :param str password: The password to use

def set_auth_credentials(username, password):
    """Override the default authentication credentials obtained from the
    environment variable configuration.

    :param str username: The username to use
    :param str password: The password to use

    """
    global _credentials, _dirty

    LOGGER.debug('Setting authentication credentials')
    _credentials = username, password
    _dirty = True