snf-django: Add retry option to AstakosClient

API method decorator should initialize the AstakosClient with the retry
argument set, in order to avoid errors caused by getting an old
connection from pool.

snf-django-lib/snf_django/lib/api/__init__.py

@@ -107,6 +107,7 @@ def api_method(http_method=None, token_required=True, user_required=True,
                     astakos = astakos_url or settings.ASTAKOS_BASE_URL
                     astakos = AstakosClient(astakos,
                                             use_pool=True,
+                                            retry=2,
                                             logger=logger)
                     user_info = astakos.get_user_info(token)
                     request.user_uniq = user_info["uuid"]