This PS fixed some imcompatibilities of inherited mariadb config with
docker-entrypoint.sh script that is now used to perform initial mariadb
nodes setup and mariadb-upgrade at startup.
Also added x509 requirement for root and audit users
connections.
Change-Id: Ic5ad2e692b64927fc73962fe0cc250a9d682114c
d0b3f1c1d2