Fix Ussuri builds due to RDO Virtualization GPG key

Stop importing the RDO virtualization GPG key in the base image. The
centos-release-openstack-ussuri package no longer includes this key.

Closes-Bug: #1919096

Change-Id: Ib3e48cc202ef4ee1e62dc93b33dc9a9b58ace865

Author: markgoddard

docker/base/Dockerfile.j2

@@ -185,7 +185,6 @@ RUN rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
     '/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',
 ] %}
 
 {% set base_centos_yum_repo_packages = [