Add STACK_CLUSTER_NAME to formula systest jobs

Change-Id: I72598c23c80f66e74eb82b447bc2016a0d4cfe5d
diff --git a/jenkins/client/job/oscore/tests.yml b/jenkins/client/job/oscore/tests.yml
index cd8979e..9072380 100644
--- a/jenkins/client/job/oscore/tests.yml
+++ b/jenkins/client/job/oscore/tests.yml
@@ -64,6 +64,10 @@
                 type: string
                 default: '{{stack_reclass_branch}}'
                 description: 'Branch of repository with stack salt models'
+              STACK_CLUSTER_NAME:
+                type: string
+                default: ""
+                description: "Cluster name to use from reclass"
               # salt
               SALT_OVERRIDES:
                 type: text