Avoid restarting dbus service

Restarting the dbus service is not necessary and is now triggering
a bug[1] in systemd-logind in CentOS Stream 9.

[1] https://issues.redhat.com/browse/RHEL-21004

Change-Id: Iae47044d7a58ba6316ff5f4b5ffdc01b03eddeba

manifests/compute/libvirt/services.pp

@@ -151,11 +151,14 @@ class nova::compute::libvirt::services (
 
     # messagebus
     if( $facts['os']['family'] == 'RedHat') {
+      # NOTE(tkajinam): Do not use libvirt-service tag to avoid unnecessary
+      # restart.
       service { 'messagebus':
-        ensure => running,
-        enable => true,
-        name   => $::nova::params::messagebus_service_name,
-        tag    => 'libvirt-service',
+        ensure  => running,
+        enable  => true,
+        name    => $::nova::params::messagebus_service_name,
+        require => Anchor['nova::service::begin'],
+        before  => Anchor['nova::service::end'],
       }
     }
   }