Rollback to deprecated "logrotate" JJB option

sre-ci dislikes new parameter

Change-Id: I124e1b125343b02f167f9ea6b768e6b5f9492847
diff --git a/jobs/templates/self-deploy-virtulenvs.yaml b/jobs/templates/self-deploy-virtulenvs.yaml
index 8cc4d47..c5fd64c 100644
--- a/jobs/templates/self-deploy-virtulenvs.yaml
+++ b/jobs/templates/self-deploy-virtulenvs.yaml
@@ -20,8 +20,8 @@
     builders:
       - shell: "chmod +x tcp_tests/templates/_packer/scripts/jenkins_virtualenvs.sh"
       - shell: "export CHANGE_RIGHTS=false ; ./tcp_tests/templates/_packer/scripts/jenkins_virtualenvs.sh"
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60