Increased max saved builds property for some (primary deploy) jobs

Change-Id: I1493783847b9468c357bc2457bdcc93e46a5daf4
diff --git a/jenkins/client/job/deploy/lab/cleanup.yml b/jenkins/client/job/deploy/lab/cleanup.yml
index 93a0818..3f3875f 100644
--- a/jenkins/client/job/deploy/lab/cleanup.yml
+++ b/jenkins/client/job/deploy/lab/cleanup.yml
@@ -8,7 +8,7 @@
           display_name: "Deploy - stack cleanup"
           discard:
             build:
-              keep_num: 20
+              keep_num: 50
           scm:
             type: git
             url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"