[COMMON][MONGO] Uses new tpls for repos / images

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

As mongo 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: I9b3715de78d946d82b04f92b425bb9ae4fe2c806
3 files changed