Enhance the Ledger Installer to Support Galera Cluster Options #125

We need to support MariaDB Galera in any multi-node setups for fault tolerance within the supported platforms. In the setup of Galera, we need to also be able to define the Router to use. It could be HA Proxy, MaxScale, etc. We need to provide BSL disclaimers when using the MaxScale Router as over 2 nodes requires a License from MariaDB.