Disable CentOS LXC jobs due to the bug in systemd packaging

At the moment systemd-udev package is being resolved to
systemd-boot-unsigned due to CentOS packaging issue. Resolution to this
issue would be providing a full path to any of file that is not provided
but systemd-boot-unsigned but provided by systemd-udev
which does not have a really clean and good workaround.

So we're disabling CentOS LXC jobs for now and waiting for CentOS
waiting to fix this. There're bunch of bug reports and all systemd there
in quite a messy state overall.

Change-Id: I6e744d1e708df11204b3436c53ea6ed723683b18
(cherry picked from commit dffcff7c94)

zuul.d/project.yaml

@@ -25,9 +25,11 @@
       jobs:
         - openstack-ansible-deploy-aio_ovs_lxc-ubuntu-focal
         - openstack-ansible-deploy-aio_metal_ovs-ubuntu-focal
-        - openstack-ansible-deploy-aio_ovs_lxc-centos-9-stream
+        - openstack-ansible-deploy-aio_ovs_lxc-centos-9-stream:
+            voting: false
         - openstack-ansible-deploy-aio_metal_ovs-centos-9-stream
-        - openstack-ansible-deploy-aio_lxb_lxc-centos-9-stream
+        - openstack-ansible-deploy-aio_lxb_lxc-centos-9-stream:
+            voting: false
         - openstack-ansible-deploy-aio_lxb_metal-centos-9-stream
         - openstack-ansible-deploy-aio_lxb_lxc-ubuntu-focal
         - openstack-ansible-deploy-aio_lxb_metal-ubuntu-focal
@@ -35,9 +37,7 @@
       jobs:
         - openstack-ansible-deploy-aio_ovs_lxc-ubuntu-focal
         - openstack-ansible-deploy-aio_metal_ovs-ubuntu-focal
-        - openstack-ansible-deploy-aio_ovs_lxc-centos-9-stream
         - openstack-ansible-deploy-aio_metal_ovs-centos-9-stream
-        - openstack-ansible-deploy-aio_lxb_lxc-centos-9-stream
         - openstack-ansible-deploy-aio_lxb_metal-centos-9-stream
         - openstack-ansible-deploy-aio_lxb_lxc-ubuntu-focal
         - openstack-ansible-deploy-aio_lxb_metal-ubuntu-focal