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

Change-Id: I1493783847b9468c357bc2457bdcc93e46a5daf4
diff --git a/jenkins/client/job/deploy/k8s_control.yml b/jenkins/client/job/deploy/k8s_control.yml
index f851176..4dba2e7 100644
--- a/jenkins/client/job/deploy/k8s_control.yml
+++ b/jenkins/client/job/deploy/k8s_control.yml
@@ -8,7 +8,7 @@
           display_name: "Deploy - k8s control"
           discard:
             build:
-              keep_num: 20
+              keep_num: 50
           concurrent: false
           scm:
             type: git