- initial release of smeserver-update based on smeserver-yum
* tidy centos repos, add rocky repos, add support for metalinks,
tidy most references to yum (except manager), tidy config and templates
* yum-cron moved to dnf-automatic,
* rename yum_** esmith db, except yum_repositories
* moved yum.conf to dnf.conf with deltarpm , fastestmirror support
* add requirement for dnf post-transaction-actions
* adapt setting for priorities
* renamed yum.service to dnf.service
* TODO smeserver.py plugin
