Switch camelCase to snake_case

Change-Id: I5988c49b001d2815a628fb749243d6944c759374
diff --git a/tests/pillar/backup_server_backup_times.sls b/tests/pillar/backup_server_backup_times.sls
index 5c226b6..0d97827 100644
--- a/tests/pillar/backup_server_backup_times.sls
+++ b/tests/pillar/backup_server_backup_times.sls
@@ -6,9 +6,9 @@
       incr_before_full: 3
       backup_dir: /srv/backup
       backup_times:
-        dayOfWeek: 0
+        day_of_week: 0
 #       month: *
-#       dayOfMonth: *
+#       day_of_month: *
         hour: 4
         minute: 52
       key: