Add build discarder to some deployment jobs

  - deploy-heat-cicd-lab-dev
  - deploy_kafka_demo
  - deploy-openstack-compute

Change-Id: Ie4d08a1118d880ed32eb008cd9b5aac519040fa7
diff --git a/jenkins/client/job/deploy/lab/cicd.yml b/jenkins/client/job/deploy/lab/cicd.yml
index d524bbc..8252cfd 100644
--- a/jenkins/client/job/deploy/lab/cicd.yml
+++ b/jenkins/client/job/deploy/lab/cicd.yml
@@ -10,6 +10,9 @@
           template:
             type: workflow-scm
             concurrent: true
+            discard:
+              build:
+                keep_num: 10
             display_name: "Deploy {{name}} heat stack"
             scm:
               type: git