[ATMOSPHERE-554] [stable/zed] Disable log config append (#2257)

This is an automated cherry-pick of #2085
/assign okozachenko1203
depends-on: #2261
diff --git a/roles/designate/vars/main.yml b/roles/designate/vars/main.yml
index b6e14bd..e6bfe9b 100644
--- a/roles/designate/vars/main.yml
+++ b/roles/designate/vars/main.yml
@@ -18,6 +18,8 @@
     tags: "{{ atmosphere_images | vexxhost.atmosphere.openstack_helm_image_tags('designate') }}"
   conf:
     designate:
+      DEFAULT:
+        log_config_append: null
       database:
         connection_recycle_time: 600
         max_overflow: 50