Add STACK_DELETE param to upgrade ocata -> pike job

Change-Id: Ic5e0cc9d3c9dbb99b844e57f82b347ce772d8d29
diff --git a/jenkins/client/job/oscore/test_upgrades.yml b/jenkins/client/job/oscore/test_upgrades.yml
index 27619e3..26a9960 100644
--- a/jenkins/client/job/oscore/test_upgrades.yml
+++ b/jenkins/client/job/oscore/test_upgrades.yml
@@ -33,6 +33,10 @@
               FLAVOR_PREFIX:
                 type: string
                 default: 'dev'
+              STACK_DELETE:
+                type: boolean
+                default: 'true'
+                description: Don't enable it if you need to use the lab after
               TEST_SCHEME:
                 type: string
                 description: "Yaml based scheme to be applied in testing"