Add stateless security group test case

It's a simple test case that creates, updates a stateless SG and
checks that the attribute is updated accordingly.

Related-Bug: #1949451
Depends-On: I85f7749e7e6186b9e3a7534bce6c306b18702333
Change-Id: I30e0a11c45618cbdaa0130942cb67ea99bbd0b92
diff --git a/zuul.d/master_jobs.yaml b/zuul.d/master_jobs.yaml
index 68c7209..465b33f 100644
--- a/zuul.d/master_jobs.yaml
+++ b/zuul.d/master_jobs.yaml
@@ -74,6 +74,7 @@
         - standard-attr-segment
         - standard-attr-tag
         - standard-attr-timestamp
+        - stateful-security-group
         - subnet_allocation
         - subnet-dns-publish-fixed-ip
         - subnet-service-types