Use correct package name for mysql/mariadb
Use correct package name for mysql/mariadb

The yumdownloader seems pickier about the package name than yum, so it wasn't downloading mariadb when given the name "mysql"
binford2k/pltraining-bootstrap,puppetlabs/pltraining-bootstrap,binford2k/pltraining-bootstrap,samuelson/pltraining-bootstrap,samuelson/pltraining-bootstrap,joshsamuelson/pltraining-bootstrap,binford2k/pltraining-bootstrap,puppetlabs/pltraining-bootstrap,kjhenner/pltraining-bootstrap,joshsamuelson/pltraining-bootstrap,kjhenner/pltraining-bootstrap,samuelson/pltraining-bootstrap,joshsamuelson/pltraining-bootstrap,puppetlabs/pltraining-bootstrap,kjhenner/pltraining-bootstrap