RPM-GPG-KEY-CentOS-SIG-Virtualization-RDO key removed from centos-release-openstack-ussuri

A new release of the centos-release-openstack-ussuri package no longer includes RPM-GPG-KEY-CentOS-SIG-Virtualization-RDO

https://centos.pkgs.org/8-stream/centos-extras-x86_64/centos-release-openstack-ussuri-1-5.el8.noarch.rpm.html

Which has been removed in master and stable/victoria, but is still in stable/ussiri

The absence of this key causes kolla-build for Ussuri to fail with the error:

```
INFO:kolla.common.utils.base:/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Virtualization-RDO: import read failed(2).
```

This can be resolved from removing the key from the Dockerfile template as per the patch:

```
--- a/docker/base/Dockerfile.j2
+++ b/docker/base/Dockerfile.j2
@@ -184,8 +184,7 @@ RUN rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
 {% set base_centos_yum_repo_keys = [
     '/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Cloud',
     '/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-OpsTools',
- '/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Storage',
- '/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Virtualization-RDO',
+ '/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Storage'
 ] %}

 {% set base_centos_yum_repo_packages = [
--
```

In it's current state stable/ussuri and the tag 10.2.0 can not be built.