In order to get a more complete container logging, we now enable
the file logging for the podman containers.
This will output container stdout/stderr in a file located in the
new /var/log/containers/stdouts location.
This follows the other efforts already made with paunch[1] and
docker-puppet.py (now named container-puppet.py)[2]
Notes:
- podman supports only "json-file", allowing to push files in the
location we want via the "path" log option
- docker doesn't have the "path" log option and push its log in
/var/lib/docker/containers/ID/ID-json.log - unusable since it's
destroyed upon container removal.
[1] https://review.openstack.org/635437
[2] https://review.openstack.org/635438
Change-Id: Ibaa8bca52ea2f68afa1effc989b04d2e6213813a
be1c9e1f85