Provision MySQL
Summary:
MariaDB has been selected as MySQL server flavour,
to get Cassandra, Aria and XtraDB.
FreeBSD servers with ZFS can benefit from a tweaked configuration
to avoid a duplicate InnoDB/ZFS cache, and to adjust block size.
For FreeBSD, we also require MariaDB 10.2 instead of 10.1.
Fixes T1306.
Test Plan: Deploy on Ysul and check ZFS partitions are populated
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T1306
Differential Revision: https://devcentral.nasqueron.org/D1122