Revert "Pin systemd to 252-15 for CentOS Stream 9"

This reverts commit dd9f50258b.

Change-Id: Iec5e04051f1f13ebc49b6bb9fdfebfa2213c14e4

playbooks/roles/bifrost-create-vm-nodes/tasks/main.yml

@@ -23,18 +23,6 @@
     - ansible_distribution == "CentOS"
     - ansible_distribution_version|int >= 9
 
-# NOTE(rpittau): systemd-252-16.el9 breaks CS9
-# see https://bugs.launchpad.net/neutron/+bug/2029335
-- name: "Pin systemd to a non-broken version in CentOS Stream 9"
-  dnf:
-    allow_downgrade: true
-    allowerasing: true
-    name: systemd-252-15.el9
-    state: present
-  when:
-    - ansible_distribution == "CentOS"
-    - ansible_distribution_version|int >= 9
-
 - name: "Load distribution defaults"
   include_vars: "{{ item }}"
   with_first_found:

zuul.d/project.yaml

@@ -15,9 +15,7 @@
         - bifrost-integration-redfish-vmedia-uefi-ubuntu-jammy
         - bifrost-integration-redfish-vmedia-uefi-centos-9
         - bifrost-upgrade-ubuntu-jammy
-        # NOTE(rpittau): disabled until we fix CS9 jobs in
+        - bifrost-upgrade-keystone-centos9
-        # stable branches
-        #- bifrost-upgrade-keystone-centos9
         # Non-voting jobs
         - bifrost-integration-tinyipa-keystone-ubuntu-focal:
             voting: false
@@ -67,9 +65,7 @@
         - bifrost-integration-redfish-vmedia-uefi-ubuntu-jammy
         - bifrost-integration-redfish-vmedia-uefi-centos-9
         - bifrost-upgrade-ubuntu-jammy
-        # NOTE(rpittau): disabled until we fix CS9 jobs in
+        - bifrost-upgrade-keystone-centos9
-        # stable branches
-        #- bifrost-upgrade-keystone-centos9
     experimental:
       jobs:
         - bifrost-benchmark-ironic