beta: Create and mount LVM volumes for mariadb
Previous beta database instances have manually provisioned LVM volumes
for the mariadb data directory. Provision these volumes automatically
using 80% of available space.
An additional LVM volume was added using 100% of the remaining space
(20%) for the tmp directory.
Bug: T138778
Change-Id: I4b856c0c7de52f7c16e75acf581443238b07419d