Rollback to deprecated "logrotate" JJB option

sre-ci dislikes new parameter

Change-Id: I124e1b125343b02f167f9ea6b768e6b5f9492847
diff --git a/jobs/templates/heat-cicd-pike-dvr-sl.yml b/jobs/templates/heat-cicd-pike-dvr-sl.yml
index 7f48f08..91db005 100644
--- a/jobs/templates/heat-cicd-pike-dvr-sl.yml
+++ b/jobs/templates/heat-cicd-pike-dvr-sl.yml
@@ -9,8 +9,8 @@
     triggers:
     - timed: '{obj:trigger_time}'
     properties:
-    - build-discarder:
-        days-to-keep: 365
+    - logrotate:
+        DaysToKeep: 365
         num-to-keep: 50
     parameters:
     - string:
@@ -221,6 +221,6 @@
           clean:
             before: true
       script-path: jobs/pipelines/deploy-cicd-and-run-tests.groovy
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60