Temporary switch lb/ovs/ovn scenario jobs to cirros-0.5.3

With cirros-0.6+ we hitting random issues as mentioned
in the related bug, until the cirros fix[1] merge and have
new cirros release let's switch to older cirros image.

[1] https://github.com/cirros-dev/cirros/pull/116
Related-Bug: #2045549

Depends-On: https://review.opendev.org/c/openstack/neutron/+/924213
Change-Id: I9f3a72da13212f735d51c7929b05706ba063f313
diff --git a/zuul.d/base-nested-switch.yaml b/zuul.d/base-nested-switch.yaml
index 8533e07..f8fa799 100644
--- a/zuul.d/base-nested-switch.yaml
+++ b/zuul.d/base-nested-switch.yaml
@@ -34,9 +34,10 @@
         # NOTE(ykarel): seeing issues with host-passthrough mode
         # https://bugs.launchpad.net/neutron/+bug/2036603
         # LIBVIRT_CPU_MODE: host-passthrough
-        CIRROS_VERSION: 0.6.2
-        DEFAULT_IMAGE_NAME: cirros-0.6.2-x86_64-disk
-        DEFAULT_IMAGE_FILE_NAME: cirros-0.6.2-x86_64-disk.img
+        # TODO(ykarel): switch to 0.6.2+ once lp#2045549 is fixed
+        CIRROS_VERSION: 0.5.3
+        DEFAULT_IMAGE_NAME: cirros-0.5.3-x86_64-disk
+        DEFAULT_IMAGE_FILE_NAME: cirros-0.5.3-x86_64-disk.img
 
 # Base nested switch job for yoga and zed
 - job: