[COMMON][MARIADB-INIT] Uses new tpls for repos / images

This commit makes mariadb init template to use the new generator for
repositories and images.

As mariadb images are coming from dockerhub, we're using directly this
repository.

Issue-ID: OOM-2364
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I21e99fc4c7c4d968b393d27dfad2b51bcc5c2cfd
3 files changed