MySQL example should provide for / allow for replication setups

[pcrews]

What would you like to be added:
The ability to create a MySQL installation that leverages either native or Galera-based replication

Why is this needed:
Database replication is a key requirement for high-availability and workload partitioning (read/write nodes, etc).

If we are not going to provide an easy way to leverage native MySQL HA features, we should perhaps explore performance tests on how auto-replacement of db-nodes works vs. something like haproxy + galera.