Rollback to deprecated "logrotate" JJB option

sre-ci dislikes new parameter

Change-Id: I124e1b125343b02f167f9ea6b768e6b5f9492847
diff --git a/jobs/templates/swarm-run-pytest.yml b/jobs/templates/swarm-run-pytest.yml
index a511794..681c460 100644
--- a/jobs/templates/swarm-run-pytest.yml
+++ b/jobs/templates/swarm-run-pytest.yml
@@ -89,6 +89,6 @@
           refspec: ${{TCP_QA_REFS}}
           url: https://gerrit.mcp.mirantis.com/mcp/tcp-qa.git
       script-path: jobs/pipelines/swarm-run-pytest.groovy
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60