RDO Updates

Promotions
* Latest promotions (TripleO CI):
   * Master CentOS8: 1st April
   * Train: 2nd April
   * Stein: 1st April

Packages
* ansible-tripleo-ipa is Added to ussuri and being added in Train
* python-ovn-octavia-provider is being added to ussuri
* Ansible is being updated to 2.9.6 in Ussuri
* python-etcd3gw is being updated to 0.2.5 in Ussuri and Train
* libsodium is updated to 1.0.18 in Train
* octavia-tempest-plugin is being updated to 0.3.0 in Train
* subunit is updated to 1.4.0 in Ussuri and Train
* python-XStatic-mdi has been updated in Ussuri
* ndisc6 is being added to Ussuri on CentOS8 deps
* puppet is being updated to 6.9.0 in CentOS 8

Vexxhost
* ci.centos weirdo jobs are migrated to vexxhost, Other RDO jobs are also being evaluated on vexxhost
   * https://review.rdoproject.org/r/#/q/topic:vexxhost
* Review.rdoproject.org and softwarefactory-project.io have been successfully migrated from rdo-cloud to vexxhost.

Other
* CentOS8 Preparation:
   * Good progress in adding CentOS8 jobs by TripleO CI team:
      * https://hackmd.io/HrQd03c9SxOMtFPFrq50tg?view
   * Advanced Virtualization has been built by Virt SIG in CBS and it’s expected that we will be able to start using them soon.
   * Some epel packages are being added to RDO CentOS8 repos
      * https://trello.com/c/OmeqSzC8/734-use-mock-from-non-epel-repo
* Rabbitmq has been built for CentOS 8 in Messaging SIG. RDO will install it from their repos:
   * https://cbs.centos.org/koji/builds?tagID=2036

On behalf of RDO