Purge resource type.

def purge(context, resource, **kwargs):
    """Purge resource type."""
    uri = '%s/%s/purge' % (context.dci_cs_api, resource)
    if 'force' in kwargs and kwargs['force']:
        r = context.session.post(uri, timeout=HTTP_TIMEOUT)
    else:
        r = context.session.get(uri, timeout=HTTP_TIMEOUT)
    return r