MDBCI now supports separate Galera server .cnf configuring.
Changing MDBCI config template in order to use this MDBCI
capability. It allows to use any MariaDB product in the
backend (Community or Enterprise, production, staging or CI)
Now MDBCI is responsible for Clustrix installation
as well as license processing.
Clustrix version is hardcoded now
(until MDBCI fix for finding latest version)
