[CLOUDOPS-548] Allow retry on openstack HttpException
diff --git a/test-requirements.txt b/test-requirements.txt
index 2c28785..afd3e2f 100755
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,3 +10,4 @@
 stestr>=1.0.0 # Apache-2.0
 testtools>=1.4.0 # MIT
 pre-commit
+tenacity