Rollback to deprecated "logrotate" JJB option

sre-ci dislikes new parameter

Change-Id: I124e1b125343b02f167f9ea6b768e6b5f9492847
diff --git a/jobs/templates/test-scenarios.yml b/jobs/templates/test-scenarios.yml
index 1d26ca0..2df3f5d 100644
--- a/jobs/templates/test-scenarios.yml
+++ b/jobs/templates/test-scenarios.yml
@@ -93,9 +93,9 @@
 
     jobs:
       - '{test_scenario}'
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60
 
 - job-group:
     name: 'ceph-tests'
@@ -118,9 +118,9 @@
           display-name: Failover tests for Ceph nodes
     jobs:
       - '{test_scenario}'
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60
 
 - job-group:
     name: 'update-tests'
@@ -206,9 +206,9 @@
 
     jobs:
       - '{test_scenario}'
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60
 
 ###################### JOB TEMPLATE ###################
 - job-template:
@@ -220,9 +220,9 @@
     disabled: '{disabled|false}'
     quiet-period: 2
     node: 'openstack_slave_{deployment}'
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60
       num-to-keep: 60
       artifact-num-to-keep: 60
     # Requires the Jenkins BuildResultTrigger Plugin