Add testrail milestone for osccore jobs

Change-Id: Ifac6601fe196b84828dab906276fed1408020d52
PROD: PROD-20180
diff --git a/jenkins/client/job/oscore/tests.yml b/jenkins/client/job/oscore/tests.yml
index be2326b..a85342d 100644
--- a/jenkins/client/job/oscore/tests.yml
+++ b/jenkins/client/job/oscore/tests.yml
@@ -148,6 +148,10 @@
                 type: boolean
                 description: Whether to use container with rally
                 default: "{{use_rally}}"
+              TEST_MILESTONE:
+                type: string
+                description: Product milestone
+                default: ""
         test-openstack-component-periodic:
           name: "{{job_prefix}}-{{milestone}}-{{model}}-{{openstack_version}}-{{formula_pkg_revision}}"
           template: